4r^2-7r=-9

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



4r^2-7r=-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

4r^2-7r+9=0

a = 4; b = -7; c = +9;
Δ = b2-4ac
Δ = -72-4·4·9
Δ = -95
Delta is less than zero, so there is no solution for the equation

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