Please help, I'd really appreciate it! :)))
1. Is this polynomials a perfect square trinomial? Why or why not?
25x^2-40x+64
Yes, because the first and last terms are perfect squares.
Yes, because the middle term is the square root of the first term multiplied to the square root of the last term.
No, because the first and last terms are not perfect squares.
No, because the middle term is the square root of the first term multiplied to the square root of the last term.

2. Is this a difference of squares? Why or why not?
9x^2+49

Yes, because terms separated by an addition sign.
Yes, because both terms are perfect squares.
No, because terms are separated by an addition sign.
No, because the first term is not a perfect square

3. Is this polynomial a sun of squares? Why or why not?
14x^2+81
Yes, both terms are perfect squares and separated by an addition sign.
No, because the first term is not a perfect square.
No, because the last term is not a perfect square.
No, because terms are separated by an addition sign.