Question

Which polynomial is a perfect square trinomial?

36x^2 − 18x − 9

4a^2 − 28a − 49

25b^2 − 40b + 16

4x^2 − 6x + 9

Answer 1

id bet 3 or 4

Answer 2

\[(6x-3)^2=36x^2-2(6)(3)x+9 \]
\[(2a-7)^2=4a^2-2(2)(7)+49\]
\[(5b-4)^2=25b^2-2(5)(4)+16\]
\[(2x-3)^2=4x^2-2(2)(3)+9\]

Answer 3

ohohohoh..... discriminate of zero lol

Answer 4

-2(2)(3) is not -6
so whats left?
i give you a hint look at choice 3

Answer 5

25b^2 − 40b + 16

40^2 -4(25)(16)

1600 -100(16)

1600 -1600 = 0

Answer 6

.... also? ;)

Answer 7

i figured it needed a + on the rearend

Answer 8

and 4 just looked rather weak and pathetic

Answer 9

yes it does

Answer 10

What are the factors of 3x^2 + 10x + 8?