Question

What is the mistake NEED ANSWER ASAP​

Answer 1

The answers are in the image.

Explanation:

Charlie made the mistake by not getting the equation equal to zero.

`x^2 - 9x + 8 = 16`

Subtract 16 to both sides making it equal to 0.

`x^2 - 9x - 8 = 0`

Using Quadratic Formula to Solve for x.