Question

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

Answer 1

a)10
b)25
c)100

Answer 2

A perfect square trinomial is of the form: ax^2 +bx +c where c=(b/2)^2.

x^2 -10x +c where c=(-10/2)^2 = (-5^2) = 25

Answer 3

...also known as Completing the Square. Not a very cool sounding name, but informative nonetheless :)