Question

1. The possible missing terms to make x²_____+100 a perfect square trinomial are

a. 4x and 25x.
b. -10x and 10x.
c. -20x and 20x.
d. -4x and -25x.

Answer 1

c. -20x and 20x

Explanation:

x² is the square of x.

100 is the square of 10 and of -10.

The middle term of (a + b)² is 2ab.

For b = 10:

2ab = 20x

for b = -10:

2ab = -20x

Answer: c. -20x and 20x