y = \frac { 1 } { 4 } x ^ { 4 } - 3 x ^ { 3 } + 4 x ^ { 2 } [ - 7,2 ]
Solve for y
y=\frac{x^{2}\left(x^{2}-12x-115,2\right)}{4}
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y=\frac{1}{4}x^{4}-3x^{3}-28,8x^{2}
Multiply 4 and -7,2 to get -28,8.
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