(x + 5)(x + 8)
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That doesn't factor neatly. Applying the quadratic equation, we find two imaginary solutions: (8 plus or minus 4i) divided by 5x = 1.6 + 0.8ix = 1.6 - 0.8iwhere i is the square root of negative one.
(x - 5)(x - 3)
X(5-8)
Take out the common factor, 3: 3x + 6 = 3(x + 2).
4x2 + 8x + 4 = 4 (x2 + 2x + 1) = 4 (x + 1)2