Question

The product of (a - b)(a - b) is a perfect square trinomial.
Answer choices below :)

Answer 1

Sometimes

Always

Never

Answer 2

its never

Answer 3

its never

Answer 4

(a - b)(a - b) = a^2 -2ab + b^2

Answer 5

why never?
\[(a - b)(a - b) =(a-b)^2\] so of course it is a perfect square
it is a square before you start

Answer 6

Yahoo says always xD Im confused

Answer 7

it is a square because \(5\times 5=5^2\) and \(x\times x=x^2\)
and \((a-b)(a-b)=(a-b)^2\)