7r^2+4=-9r

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Solution for 7r^2+4=-9r equation: 



7r^2+4=-9r

We move all terms to the left:

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

We get rid of parentheses

7r^2+9r+4=0

a = 7; b = 9; c = +4;
Δ = b2-4ac
Δ = 92-4·7·4
Δ = -31
Delta is less than zero, so there is no solution for the equation

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