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Which polynomial is a perfect square trinomial?
a. 25^x2 − 20x − 16
b. 9a^2 − 30a − 25
c. 25b^2 − 15b 9
d. 16x^2 − 24x 9?

Respuesta :

apologiabiology
a polynomial is a perfect square trinomial if in form

a^2x^2-2ab+b^2

look at each

we can eliminate A and B since we have -b^2 not +b^2

look at the rest

C. 5^2b-3*5*b+3^2
nope

D. 4^2x^2-2*4*3x+3^3
yes

answe is D (factors to (4x-9)^2)

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