A trinomial is perfect square if it can be factored into the form
It can be factored as the SQUARE OF A BINOMIAL
A trinomial is perfect square if it can be factored into the form (a+b)2 So a2 +2ab+b2 would work.
The given quadratic expression can not be factored as a perfect square.
4x2-42x+110 = (2x-10)(2x-11) when factored
Yes; the factored form would be (9c+4)(9c+4) or just (9c+4)2 Since the two factors are the same, the beginning trinomial 81c2+72c+16 is a perfect square trinomial
Yes because 25x2-70x+49 = (5x-7)(5x-7) when factored
If you mean: n2+20n+100 then yes it is because (n+10)(n+10) when factored
x2-18x+81 = (x-9)(x-9) when factored
Yes because if x2-14x+49 then it is (x-7)(x-7) when factored
x2+14x+49 = (x+7)(x+7) when factored