Question

Solve the following equation for x. x^2 - 36 = 0

A. x=1 x=-36
B. x=-1 x=36
C. x=-6 x=6
D. x=-18 x=18

Answer 1

The answer is C.x=6,x=-6

Explanation:

Greetings!

• x²-36=0
• x²-36+36=0+36.. add 36 both sides
• x²=36... simplify

An assumption

"In general, all equations of the form x² = a, where a is a positive number, will always give two solutions, namely x = - √a or x = √a."

Thus,

• x= √ 36, x= - √ 36
• x=6, x=-6