-87=3r(3r+8)

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Solution for -87=3r(3r+8) equation: 



-87=3r(3r+8)

We move all terms to the left:

-87-(3r(3r+8))=0



We calculate terms in parentheses: -(3r(3r+8)), so:

3r(3r+8)

We multiply parentheses

9r^2+24r

Back to the equation:

-(9r^2+24r)



We get rid of parentheses

-9r^2-24r-87=0

a = -9; b = -24; c = -87;
Δ = b2-4ac
Δ = -242-4·(-9)·(-87)
Δ = -2556
Delta is less than zero, so there is no solution for the equation

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