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1 solution
If x = 7 − 1 ⇒ x 2 + 2 x − 6 = 0
3 x 3 + 1 2 x 2 − 6 x − 1 2 = 3 x 3 + 1 2 x 2 − 6 x − 3 6 + 2 4 = ( x 2 + 2 x − 6 ) ( 3 x + 6 ) + 2 4 = 0 + 2 4 = 2 4