book Maths Puzzle Numerical Ability

X/3 = -6

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This year the sales for homegrown video are 35 % higher than last year. This year the sales are $ 182.250. What were the sales last year My teacher has our advanced algebra class taking college algebra tests just for the heck of it.
The problem asks to find a polynomial equation of degree 4 with integral coefficients that has solutions 1+i, 3, 0.