You need at least two terms to find a GCF.
49
49x.
98x
4x2+49x+90 = (4x+9)(x+10) when factored
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7x^3. That is 7x cubed.... or 7x*7x*7x (where * means multiply). You should get 343x
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 + 4)(49x^2 - 28x + 16)
(7x + 6)(49x^2 - 42x + 36)
7x2+49x-42 = 7(x2+7x-6)
(3x - 8)(8x + 5)