Question

Can anybody help me? I'm stuck.
1. What number should be added to the expression x^2+6x to change it into a perfect square trinomial?

A. 3

B. 6

C. 9

D. 12

Answer 1

6 is not a perfect sqaure, but 9 is

Answer 2

sqrt(9) = 3

Answer 3

can you help me with 2 more?

Answer 4

I can try one more.

Answer 5

To make ax^2 +bx a perfect square, add the term ( b^2 / (4a) )

Answer 6

What number should be added to the expression x2 + 4x to change it into a perfect square trinomial?









A.
1







B.
2







C.
8







D.
4

Answer 7

Use thus formula:
To make ax^2 +bx a perfect square, add the term ( b^2 / (4a) )
Here the expression is x^2 + 4x
compare it to ax^2 + bx.
a = 1, b = 4
add the term ( b^2 / (4a) ).
Just plug in a = 1, b = 4