Question

Help Help?(:
Check all polynomials that are perfect square trinomials: (1 point)

49x2 − 8x + 16
4a2 − 20a + 25
25b2 − 5b + 10
16x2 − 8x + 1

Answer 1

well is (7x-4)^2 equal to the first one?
is (2a-5)^2 equal to the second one?

Answer 2

Yes and no

Answer 3

I think... :/

Answer 4

in what order is that yes and no

Answer 5

yes

Answer 6

huh

Answer 7

I'm so confused ):

Answer 8

why do you answer yes to what order are your yes and nos?

Answer 9

wait. the answer is the second and fourth one. I just figured it out :p

Answer 10

ok sounds great

Answer 11

Thank you though!(:

Answer 12

If ax² + bx + c is a perfect square, then the discriminant is 0. The discriminant = b² - 4ac
49x² − 8x + 16: discriminant = (-8)² - 4(49)(16) = -3072
4a² − 20a + 25: discriminant = (-20)² - 4(4)(25) = 0
25b² − 5b + 10: discriminant = (-5)² - 4(25)(10) = -975
16x² − 8x + 1: discriminant = (-8)² - 4(16)(1) = 0