# Immediate reaction to: how do you find the root of an equation?

Contents

To find the root of an equation, set the equation equal to zero and solve for the variable using algebraic manipulation or numerical methods such as Newton’s method or the bisection method.

Now let’s take a closer look

Finding the root of an equation is essential in many fields of mathematics, engineering, and science. The root of an equation is the value of the variable that satisfies the equation. For instance, the root of the equation x^2 – 4 = 0 is x = 2 or x = -2. There are numerous methods to find the root of an equation, both algebraic and numerical.

One of the algebraic methods is to manipulate the equation until the variable is isolated and then solve for the variable. For example, to find the root of the equation (3x + 2)(x – 4) = 0, we can use the zero product property to obtain 3x + 2 = 0 or x – 4 = 0. Therefore, the roots of the equation are x = -2/3 and x = 4.

However, sometimes it is not possible to solve equations algebraically. In that case, numerical methods can be used. There are various numerical methods to find roots, such as the bisection method, Newton’s method, and the Secant method.

The bisection method is an iterative algorithm in which the interval that contains the root is halved in each iteration until the root is found. Newton’s method is another iterative algorithm that uses the derivative of the function to approximate the root. The Secant method, similar to Newton’s, uses two approximations to the root to refine the estimation of the root.

“A mathematician’s apology” by G. H. Hardy has an interesting quote regarding the importance of finding roots: “A mathematician, like a painter or poet, is a maker of patterns. If his patterns are more permanent than theirs, it is because they are made with ideas.”

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There are many fascinating facts about finding roots of equations. For example:

• Finding roots has been a crucial problem throughout history. The ancient Babylonians used geometric methods to solve quadratic equations.
• The ancient Egyptians used the method of false position, which is another iterative method to solve linear equations with one unknown variable.
• The study of roots led to the creation of complex numbers. The square root of negative numbers cannot be represented in the real number system, and so mathematicians created imaginary numbers.
• The Fundamental Theorem of Algebra states that every polynomial equation has at least one root, which can be real or complex.

Here is a table that shows some of the most commonly used numerical methods to find roots, as well as their advantages and disadvantages:

Bisection Simple, always converges if there is a root in interval Slow convergence
Newton’s Fast convergence, efficient for finding complex roots Requires derivative of the function, not always stable
Secant Fast convergence Not always stable, may converge to the wrong root

In conclusion, finding roots of equations is an essential concept for all mathematical and scientific fields. Whether using algebraic or numerical methods, seeking for the roots of equations consists of finding critical values of variables that can help deduce conclusions, patterns, and behaviors of a system.

## Video response

This video teaches how to find the roots of a quadratic equation using the quadratic formula. The first step is to set the quadratic equal to zero and label the coefficients as a, b, and c. Then, we calculate the discriminant to determine the nature of the solutions. If the discriminant is not a square number, we get two real irrational solutions. Finally, we plug in the values of a, b, and c into the quadratic formula and simplify the expression by dividing each term by 2 if possible.

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## I discovered more answers on the internet

To find the real roots of a function, find where the function intersects the x-axis. To find where the function intersects the x-axis, set f(x)=0 and solve the equation for x.

The most straightforward method is to draw a picture of the function and ﬁnd where the function crosses x-axis. Graphically ﬁnd the root: Plotf(x)for differ- ent values ofxand ﬁnd the intersection with thexaxis. Graphical methods can be utilized to provide estimates of roots, which can be used as start- ing guesses for other methods.

To find the real roots of a function, find where the function intersects the x-axis. To find where the function intersects the x-axis, set f (x) = 0 and solve the equation for x. If the function is a linear function of degree 1, f (x) = m x + b and the x-intercept is the root of the equation, found by solving the equation for x.

To find the roots factor the function, set each facotor to zero, and solve. The solutions are the roots of the function.

For the second equation:y=x4−8×2+8
let A=x2.

y=x4−8×2+8⟹y=A2−8A+8

y=A2−8A+8 is in quadratic form, you can solve it like a quadratic equation.

Once you find the value of A, substitute A for x2, to find the possible values of x.

Step By Step. Solve for A in:

0=A2−8A+8

What do you get?

A=4±√16−8=4±2√2

Substituting x2 for A, you get:
x2=4±2√2

x=±√4±2√2

## People are also interested

Subsequently, How do you find quadratic equation given roots?
the sum of its roots = –b/a and the product of its roots = c/a. A quadratic equation may be expressed as a product of two binomials. Here, a and b are called the roots of the given quadratic equation.

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Correspondingly, What is the number of roots of the equation? The number of roots of a polynomial equation is equal to its degree. So, a quadratic equation has two roots. Some methods for finding the roots are: All the quadratic equations with real roots can be factorized. The physical significance of the roots is that at the roots of an equation, the graph of the equation intersects x-axis.

Simply so, How many roots can a quadratic equation have? The reply will be: The roots of a quadratic function are the x-coordinates of the x-intercepts of the function. Since the degree of a quadratic equation is 2, it can have a maximum of 2 roots. We can find the roots of quadratic equations using different methods.

How do you find quadratic equation given roots? In reply to that: the sum of its roots = –b/a and the product of its roots = c/a. A quadratic equation may be expressed as a product of two binomials. Here, a and b are called the roots of the given quadratic equation.

What is the number of roots of the equation? The number of roots of a polynomial equation is equal to its degree. So, a quadratic equation has two roots. Some methods for finding the roots are: All the quadratic equations with real roots can be factorized. The physical significance of the roots is that at the roots of an equation, the graph of the equation intersects x-axis.

In respect to this, How many roots can a quadratic equation have? Response: The roots of a quadratic function are the x-coordinates of the x-intercepts of the function. Since the degree of a quadratic equation is 2, it can have a maximum of 2 roots. We can find the roots of quadratic equations using different methods.

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