What are the solutions of the equation x4 – 9x2 + 8 = 0? use u substitution to solve.

Step-by-step explanation:

We have the following equation

To solve this problem, do:

then it has:

Then he has a second-degree equation.

To resolve factor.

You must find 2 numbers that when you add them get -9 and multiply them get 8.

These numbers are:

u = -1 and u = -8

Then it has:

and

Remember that

Then it has:

ANSWER

EXPLANATION

Given;

We can rewrite as

Let

This implies that,

This implies that,

But

This implies that,

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.