Question

Easy Medal

Answer 1

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

\[x^2+14x\]


A. 7


B. 14


C. 28


D. 49

Answer 2

That didn't really help...

Answer 3

not to be rude..

Answer 4

Basically, the third term in a perfect trinominal has to be a perfect square.

Answer 5

":What number should be added to the expression to change it into a perfect square trinomial?

x^2+14x "

You need to apply the procedure of "completing the square" here.

Given x^2 + bx,

1) Take (1/2) of b: (b/2). What is (1/2) of b in this case (b=14)?

2) Square your result. In other words, square (b/2)

3) Add your result [ (b/2)^2 ] to x^2 + bx and then subtract the same thing.

4) Re-write the left 3 terms as the square of a binomial.

Try it, please.

What is 14/2?

What is (14/2)^2?