Question

Make a question similar to the one below:

for example:
Solve this quadratic equation: x^2 = 81

and then solve it and explain how you did it.

Answer 1

two solutions : 9 ; -9

Explanation:

x²=81

means : x² - 81 =0 but 81 = 9²

use identity ; a² - b² = (a-b)(a+b)

x² -9² = 0 : (x-9)(x+9)=0

x-9=0 or x+9 = 0

x =9 or x = -9