Question

Which of the following is perfect square trinomial. Ive asked 4 times. Please Help. Will give brainlilest

Answer 1

Answer:

D

Step-by-step explanation:

a perfect square trinomial is

$a^2x^2\pm2(ab)xy+b^2y^2$

factorized is

$(ax\pm by)^2$

so as you can see option A and B can't be, because they have -49y^2 and it has to be plus

so the other options are C and D

in the trinomial a=4 and b=\pm 7

the roots of a^2 and b^2

$\pm2abxy=\pm2(4)(7)xy\\\\=\pm56xy$

so it's option d with b=-7

$16x^2-56xy+49y^2$