Question

x2 - 81 = 0

What is x2

Answer 1

Answer:

x = 9 and -9

Step-by-step 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

Answer 2

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.