7x2 + 7x - 14
= 7(x2 + x - 2)
= 7(x + 2)(x - 1)
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(x2 + 7x - 18) = (x + 9)(x - 2)
If that was 2x^2 + 5x + 2, it would factor to (2x + 1)(x + 2)
14x2 + 29x - 15= 14x2 + 35x - 6x - 15= 7x(2x + 5) - 3(2x + 5)= (2x + 5)(7x - 3)
It's just a mathematical polynomial: 7x + 3y.
7x = 5+5x 7x-5x = 5 2x = 5 x = 2.5