Which value must be added to the expression x^2 + 16x to make it perfect-square trinomial?

A-8

B-32

C-64

D-256

Edit: it's not A

Question

Mathematics

Darryl Mcdaniel

15 January, 17:32

Which value must be added to the expression x^2 + 16x to make it perfect-square trinomial?

A-8

B-32

C-64

D-256

Edit: it's not A

+3

Answers (1)

Know the Answer?

Mike Summers · Answer 1

X^2 + 16x + ?

a^2 + 2ab + b

(a + b) ^2 which is a perfect square.

To find b to determine the last value, you divide 16x by 2x.

so:

b = 8

the last value would be 8^2 which is 64.

Hence answer is C - 64

Which value must be added to the expression x^2 + 16x to make it perfect-square trinomial?A-8B-32C-64D-256Edit: it's not A

Which value must be added to the expression x^2 + 16x to make it perfect-square trinomial?

A-8

B-32

C-64

D-256

Edit: it's not A