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Dimitri is solving the equation x^2 – 10x = 21. Which value must be added to both sides of the equation to make the left side a perfect-square trinomial?

A0
B4
C25
D100

Verified Answer :

meerkat18

we are given the expression x 2 - 10x = 21  where a number is to be added in both sides to complete the equation by completing the square. In this case, (-10/2)^2 is equal to 25. The number that is added in the left side of the equation is equal then to 25. 

Answer:

The answer is C. 25

Step-by-step explanation:

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