90=4x+1/2x^2

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Solution for 90=4x+1/2x^2 equation: 



90=4x+1/2x^2

We move all terms to the left:

90-(4x+1/2x^2)=0



Domain of the equation: 2x^2)!=0

x!=0/1

x!=0

x∈R



We get rid of parentheses

-4x-1/2x^2+90=0

We multiply all the terms by the denominator


-4x*2x^2+90*2x^2-1=0

Wy multiply elements

-8x^3+180x^2-1=0

We do not support expression: x^3

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