6x2 + 10x = 5
6x2 + 10x - 5 = 0
The roots are 1/(2*6)* [-10 +/- sqrt(102 - 4*6*(-5))]
= 1/(2*6) * [-10 +/- sqrt 220]
=1/6 * [-5 +/- sqrt 55]
So x = -2.0694 or 0.403
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12x - 6 = 10x +2 12x - 10x = 2 + 6 2x = 8 x = 4
x - 10x = 9x, so 9x + 3 = 0, so 9x = -3 so x = -1/3
x + 13x + 10x = 50 - 6
x2 + 10x + 21 = (x + 3)(x + 7)