C=(c-9)(c+9)

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Solution for C=(c-9)(c+9) equation: 



=(C-9)(C+9)

We move all terms to the left:

-((C-9)(C+9))=0

We use the square of the difference formula

C^2+81=0

a = 1; b = 0; c = +81;
Δ = b2-4ac
Δ = 02-4·1·81
Δ = -324
Delta is less than zero, so there is no solution for the equation

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