Question

$2 {x}^{2} + 11x - 21$

Answer 1

$2 {x}^{2} + 11x - 21 \\ 2 {x}^{2} + 14x - 3x - 21 = 0 \\ 2x(x + 7) - 3(x + 7) = 0 \\ (x + 7)(2x - 3) = 0 \\ x + 7 = 0 \\ x = - 7 \\ \\ 2x - 3 = 0 \\ x = \frac{3}{2}$

Answer 2

Factor out.
(2x - 3) (x + 7)

Roots are 2x - 3 = 0
x = 3/2

And..
x + 7 = 0
x = -7

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