Question

Determine which polynomial is a perfect square trinomial.

49x2 − 28x + 16

9a2 − 30a + 25

25b2 − 45b − 81

16x2 − 24x − 9

Answer 1

A perfect square trinomial is (ax^2 + bx +c)
u need to know that A and C are positive values and always

Answer 2

So...calculate b^2 - 4ac and the polynomial will be a perfect square if ure equations equals to zero :)

Answer 3

\[b^2 - 4ac = 28^2 - 4*16*49 = 784 - 3136\]
so A is not the answer

Answer 4

Did u understand of anything i said? You can do the same like i did for the first equation and if u get 0 that's the answer.

Answer 5

@jen1511 , do u want me to do more equation for u :) ?

Answer 6

wait what im confused

Answer 7

I'll do B for u
9a^2 − 30a + 25

9a^2 = (3a)^2

25 = 5^2

= (3a - 5) ^2

another way
b^2 - 4ac
= 30^2 - 4x9x25
= 900 - 900 = 0

Answer 8

Does equation B seems a perfect square trinomial to u?

Answer 9

I guess yeah!

Answer 10

Yes