8r-4=12+9r2+7

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Solution for 8r-4=12+9r2+7 equation: 



8r-4=12+9r^2+7

We move all terms to the left:

8r-4-(12+9r^2+7)=0

We get rid of parentheses

-9r^2+8r-12-7-4=0

We add all the numbers together, and all the variables

-9r^2+8r-23=0

a = -9; b = 8; c = -23;
Δ = b2-4ac
Δ = 82-4·(-9)·(-23)
Δ = -764
Delta is less than zero, so there is no solution for the equation

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