Question

Dimitri is solving the equation x2 – 10x = 21. Which value must be added to both sides of the equation to make the left side a perfect-square trinomial?

0
4
25
100

Answer 1

C. 25

Explanation:

Answer 2

it's 25, just did it

Explanation:

1 /2 o f ( − 10 ) = − 5 , ( − 5 )^ 2 = 25