7x2 + y
7x2
14
7x2 plus 7x5 = 49
7x2 + 68xy - 20y2
(7x2 + 9)(4x - 1)
You can take 7x2 out of both of those, leaving 5x4 and 1.
7x2=14x7=21x7=28x7=35x7=42x7=49x7=56x7=63
7x2- 63 = -35, when x equals 2
I suppose you mean, how do you factor it. 7x2 - 9x - 10 = (7x + 5)(x - 2).
84
7x2