Question

I WILL THANK AND GIVE BRAIN FOR THE CORRECT

LEVEL: VERY HARD


If x^2 = 10, what is the value of x?

±square root of 10
±square root of 20
±5
±20

Answer 1

Answer: choice A) plus or minus the square root of 10

Answer 2

Answer: choice A) plus or minus the square root of 10

We apply the square root to both sides of x^2 = 10 to get x = sqrt(10) or x = -sqrt(10). The plus or minus is from the fact that squaring a negative gives you a positive.

Another example: x^2 = 9 means x = 3 or x = -3 since (-3)^2 = 9 and (3)^2 = 9