Area=x^2+13x-90

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Solution for Area=x^2+13x-90 equation: 


Simplifying
Area = x2 + 13x + -90

Reorder the terms:
aerA = -90 + 13x + x2

Solving
aerA = -90 + 13x + x2

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by 'erA'.
a = -90e-1r-1A-1 + 13e-1r-1xA-1 + e-1r-1x2A-1

Simplifying
a = -90e-1r-1A-1 + 13e-1r-1xA-1 + e-1r-1x2A-1

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