Question

Someone please help me thank you

Answer 1

4 is the answer to the problem

Answer 2

4

Explanation:

7x = x² - 8

=> x² - 7x - 8 = 0

use quadratic formula:

a = 1, b = -7, c = -8

x =
`\frac{-(1)±\sqrt{(-7)^(2) - 4(1)(-8) } }{2(1)}` (pls ignore the "A" I don't know why it's showing up)

=> x =
`(-1±√(49 + 32) )/(2)`

=> x =
`(-1±9 )/(2)`

=> x =
`(-1 +9)/(2)` = 4 or
`(-1-9)/(2)` = -5 (the answer is only 4 since it's asking for the positive solution)