12
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That doesn't factor neatly. Applying the quadratic formula, we find two real solutions:
-1 plus or minus the square root of 11
x = 2.31662479
x = -4.31662479
(x-5)(x+3)
To solve for x: 2x2 + 10 = 58 2x2 = 48 x2 = 24 x = √24 x = √4 × √6 x = 2√6
(x - 3)(x + 5)
2x - 8 = 10 2x = 10 + 8 2x = 18 x = 18 / 2 x = 9
-2x -4 = 10 -2x = 14 -x = 14/2 -x = 7 x = -7 easy.