High School

Does [tex]x = -5[/tex] solve the following polynomial equation?

[tex]8x^5 + 39x^4 + 4x^2 = -25 + 25x + 3x^3[/tex]

Answer :

To check if x=-5 solves the polynomial equation, all terms must be moved to one side and simplified. We substitute -5 into the equation and simplify. If the result is zero, x=-5 is a solution.

To determine if x=-5 is a solution to the polynomial equation 8x⁵ + 39x⁴ + 4x² = -25 + 25x + 3x³, we need to simplify and then substitute x with -5 into the equation.

First we need to move all terms to one side of the equation to set it to zero, like this:

8x⁵ + 39x⁴ + 4x² + (-25) - 25x - 3x³ = 0

Then we substitute x with -5:

8(-5)⁵ + 39(-5)⁴ + 4(-5)² - 25 - 25(-5) - 3(-5)³

If this simplification results in zero, then x=-5 is indeed a solution. Otherwise, it is not.

Let's perform the substitution and see if the left side equals zero to confirm.