# Precalculus Examples

Replace with .

To find the roots of the equation, replace with and solve.

Rewrite the equation as .

Factor using the rational roots test.

If a polynomial function has integer coefficients, then every rational zero will have the form where is a factor of the constant and is a factor of the leading coefficient.

Find every combination of . These are the possible roots of the polynomial function.

Substitute and simplify the expression. In this case, the expression is equal to so is a root of the polynomial.

Substitute into the polynomial.

Simplify each term.

Raise to the power of .

Raise to the power of .

Multiply by .

Multiply by .

Subtract from .

Add and .

Subtract from .

Since is a known root, divide the polynomial by to find the quotient polynomial. This polynomial can then be used to find the remaining roots.

Divide by .

Write as a set of factors.

Factor using the perfect square rule.

Rewrite as .

Check the middle term by multiplying and compare this result with the middle term in the original expression.

Simplify.

Factor using the perfect square trinomial rule , where and .

Combine like factors.

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Set the factor equal to .

Add to both sides of the equation.

The solution is the result of .