Question

Which of the following are solutions to the quadratic equation below?

Check all that apply.
x2 + 8x - 9 = 0
A. 1
B. 3
C. -3
D. -9
E. -1

Answer 1

`\huge\boxed{\sd -9, \ 1}`

Explanation:

Given quadratic equation is:

x² + 8x - 9 = 0

Using mid-term break formula

x² + 9x - x - 9 = 0 (When we multiply middle terms, we get side terms as answer which is mid term break formula.)

Taking common

x(x + 9) - 1(x + 9) = 0

Take (x + 9) common

(x + 9)(x - 1) = 0

According to zero's method:

Either:

x + 9 = 0 OR x - 1 = 0

x = -9 OR x = 1

`\rule[225]{225}{2}`

Hope this helped!

~AH1807