Answer :
Well think what number when multiplied by itself = 100.
50x50=2500 so it has to be 10.
However, -x-=+ so -10x-10 is also 100.
Therefore 10 and -10 are the square roots of 100, so a and c.
50x50=2500 so it has to be 10.
However, -x-=+ so -10x-10 is also 100.
Therefore 10 and -10 are the square roots of 100, so a and c.
