It's an equation.
If you want to solve it for x, you can do so as follows:
x2 + 15x = 30
x2 + 15x + (15/2)2 = 30 + (15/2)2
(x + 15/2)2 = 30 + 225/2
x + 15/2 = ± √(285/2)
x = (-15 ± √570) / 2
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x2 + x - 30 = (x + 6)(x - 5)
x = +5 or -5
x2 + 13x = -30 ∴ x2 + 13x + 30 = 0 ∴ (x + 3)(x + 10) = 0 ∴ x ∈ {-3, -10}
x2 + 11x + 30 = 0 (x + 5)(x + 6) = 0 so the roots are -5 and -6
(x - 1)(x - 14)