Question

What values are needed to make each expression a perfect square trinomial?

x2 + 2x +___
x2 – 20x +___
x2 + 5x + ___

Answer 1

1,100,6.25

Explanation:

Answer 2

you need a number such that it = (half coefficient of x )^2

so for the first one: 1/2 * 2 = 1 , 1^2 = 1 So answer is 1

second: 1/2 * -20 = -10 , (-10)^2 = 100

third one 1/2 * 5 = 2.5 and 2.5^2 = 6.25