Question

What is the value of z so that -9 and 9 are both solutions of x2 + x = 103?

Answer 1

the correct question in the attached figure

we know that
If the solutions are -9 and 9, then we can use this to form our equation:
(x - 9)(x + 9) = 0
x² - 81 = 0
so...
x² + z - 103 = x² -81
z - 103 = -81
z = -81 + 103
z = 22

the answer is the option C) 22