Question

What value in place of the question mark makes the polynomial below a perfect square trinomial? 9x2+?x+64

Answer 1

you need so square
\[(3x+8)^2\] and see what the middle term would be

Answer 2

48?

Answer 3

Yeah, it's 48

Answer 4

\[(3x+8)(3x+8)=9x^2+3x\times 8+ 3x\times 8 + 64\]
\[=3x^2+48x+64\] you got it