Question

X2 - 81 = 0

What is x2

Answer 1

Answer: + 9

Step-by-step explanation: add 81 to both sides to isolate x^2. we get x^2= 81. take the square root of both sides. the square root of x^2 is x and square root of 81 is 9 or -9. so x = 9 and -9.

Answer 2

x = 9 and -9

Explanation:

`x^(2)` -81 = x add 81 to both sides of the equation

`x^(2)` = 81 What number times itself equals 81? 9 and -9