3x2 + 36x + 81 = 3(x2 + 12x + 27) = 3(x + 3)(x + 9), which are its prime factors; or, if you prefer, 3x2 + 36x + 81 = (3x + 9)(x + 9), which is also accurate. You may easily verify these results by multiplying back.
(3X + 9) (X + 9)
3x2+7-6 = (3x-2)(x+3) when factored
3x2 + 10x + 3 = (x + 3)(3x + 1).
3x2-7x+4 = (3x-4)(x-1) when factored
3x2 + 36x + 81 = 3(x2 + 12x + 27) = 3(x + 3)(x + 9), which are its prime factors; or, if you prefer, 3x2 + 36x + 81 = (3x + 9)(x + 9), which is also accurate. You may easily verify these results by multiplying back.
(3X + 9) (X + 9)
-(3x - 4)(x - 2)
-(3x+4)(x+2)
It is: (-3x-4)(x+2) when factored
Do you mean 3x2+10x-8 if so then it is (3x-2(x+4) when factored
(3x+1)(x+2)
3x2+7-6 = (3x-2)(x+3) when factored
3x2 + 10x + 3 = (x + 3)(3x + 1).
3x2-7x+4 = (3x-4)(x-1) when factored
90720^2=8230118400
Some signs would have made life easier at this end. (3x + 9)(x + 9) is a possibility, as is (3x - 9)(x - 9)