(7x + 8)(7x - 9)
(-7x + 3)(-7x +3)
(3x - 8)(8x + 5)
It equals 53X- a number is squared when it is multiplied by itself, so 7X by 7X = 49X. 2X by 2X =4X, so 49X + 4X is 53X.
(7x + 6)(49x^2 - 42x + 36)
It is a quadratic expression and it is (7x+6)(7x+6) when factored
7x2+49x+84 = 0 Divide all terms by 7: x2+7x+12 = 0 Factorize: (x+3)(x+4) = 0 Therefore the x intercepts are -3 and -4
7x2+49x-42 = 7(x2+7x-6)
4x2+49x+90 = (4x+9)(x+10) when factored
49
(7x + 4)(49x^2 - 28x + 16)
That doesn't look quite right. As written, that's 4x + 61, which doesn't factor. If you meant 4x2 + 49x + 12, the answer is (4x + 1)(x + 12)