It is: 2xsquared+14x-9
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5x^2 + 14x - 3x^2 - 9 = 2x^2 + 14x - 9
You can expand the first expression in parentheses, then add or subtract like terms.
If you mean: x squared -14x +45 then when factored it is (x-9)(x-5)
-x - 2 + 15x = 14x - 2 = 2(7x - 1)
2x2+14x