Question

PLEASE HELP

what is the solution(s) to the equation 5a^2 - 44 = 81

A) + or - 25
B) -5
C) + or - 5
D) + or - 125

Answer 1

you can find the answer by plugging in any of the multiple choice options into a,
when you square a number (^2), the result is always positive even if the number starts off negative,
-25 or 125 wouldn't work for this equation because the answer is too big
but when you plug -5 or 5 in you get the right answer, so the answer is c