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15x^2-12+8x = 0
Rewrite that again into descending x-powers
15x^2+8x-12 = 0
We can factorise this to
(3x-2)(5x+6) = 0
So for the equation to equal zero, either the first bracket must be zero or the second.
if 3x-2 = 0 if 5x+6 = 0
3x = 2 5x = -6
x = 2/3 x=-6/5
So x = 2/3, -6/5
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