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0=64-3x-5x^2
We move all terms to the left:
0-(64-3x-5x^2)=0
We add all the numbers together, and all the variables
-(64-3x-5x^2)=0
We get rid of parentheses
5x^2+3x-64=0
a = 5; b = 3; c = -64;
Δ = b2-4ac
Δ = 32-4·5·(-64)
Δ = 1289
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-\sqrt{1289}}{2*5}=\frac{-3-\sqrt{1289}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{1289}}{2*5}=\frac{-3+\sqrt{1289}}{10} $
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