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4x+(3-x)9x=72-5x^2+21
We move all terms to the left:
4x+(3-x)9x-(72-5x^2+21)=0
We add all the numbers together, and all the variables
-(72-5x^2+21)+4x+(-1x+3)9x=0
We multiply parentheses
-(72-5x^2+21)-9x^2+4x+27x=0
We get rid of parentheses
5x^2-9x^2+4x+27x-72-21=0
We add all the numbers together, and all the variables
-4x^2+31x-93=0
a = -4; b = 31; c = -93;
Δ = b2-4ac
Δ = 312-4·(-4)·(-93)
Δ = -527
Delta is less than zero, so there is no solution for the equation
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