Question

Solve the following quadratic equation by the square root property of equality.

x^2 - 81 = 0

Answer 1

Try using:
\[a ^{2}-b ^{2}=(a+b)(a-b)\]

Answer 2

The given equation is in this form.

Answer 3

x=9?

Answer 4

x^2 -81 = 0
(x-9)(x+9) = 0

x_1 = 9
x_2 = - 9

Answer 5

but you can writing

x^2 -81 = 0

x^2 = 81

x^2 = 9^2

x_1,2 = +/- 9