-2
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x2 + 3x - 10 = (x + 5)(x - 2) ⇒ x = -5 or 2
x2 + 3x + 7 = 5 ∴ x2 + 3x + 2 = 0 ∴ (x + 1)(x + 2) = 0 ∴ x ∈ {-2, -1}
3x-1 = 11 3x = 11+1 3x = 12 x = 4 Therefore: x2+2 = 18
-2x + 3x = -4 By combining like terms we get: x = -4.
is a quadratic equation for y, in terms of x.