Need with perfect square! 40 points

to be a perfect square C needs to be a number that can be squared

 and the middle term needs to be able to be multiplied by 2 or -2 of the square of the 3rd term (C)

 so in this case C = 25

 25 can be squared ( square root of 25 is 5)

square root of 25 (5) times 2 = 10 ( 2nd term)

C = 25

a negative exponent is translated as follows:

so, we have

i think asking google will you get the answer to that question