15x squared-12 plus 8x equals 0?

Answer 1

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