Yes because its discriminant is equal to zero
The given quadratic expression can not be factored as a perfect square.
It's a second degree trinomial expression in x. It's a perfect square, being the square of (x-2).
Factors are (7y - 3)(7y - 2) so it's not a perfect square.
Yes because if x2-14x+49 then it is (x-7)(x-7) when factored