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1 solution
There's probably an easier way to solve? This is a standard approach. ( x + 3 x + 6 + x − 3 x + 6 = 6 ) 2 2 x + 2 x 2 − ( 3 x + 6 ) = 3 6 x + x 2 − 3 x − 6 = 1 8 x 2 − 3 x − 6 = 1 8 − x x 2 − 3 x − 6 = x 2 − 3 6 x + 3 2 4 3 3 0 = 3 3 x x = 1 0