(5k+2)^2 = 64 using the square root principle?

Answers:
5k + 2 = 8 or -8
5k = 6 or -10
k = 6/5 or -2

Remember that positive numbers have TWO square roots - negative eight times negative eight is 64, also.

THIS IS SIMPLE MATH

FIGURE IT OUT!

The sqrt of 64 is +/-8, so 5k+2 = +/-8, so 5k = 6 or -10, so k = 6/5 = 1.2 or k = -2.

1.2 or -2.