Question

Which of the following constants can be added to x^2 - 10x to form a perfect square trinomial?
10
25
100

Answer 1

halve middle term
-10/2=-5
squaer it
(-5)^2=25
that is what should be added

answer is 25

Answer 2

b)-25 is the correct answer.

I just did this exact question in my schooling.