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5x^2=56-3x
We move all terms to the left:
5x^2-(56-3x)=0
We add all the numbers together, and all the variables
5x^2-(-3x+56)=0
We get rid of parentheses
5x^2+3x-56=0
a = 5; b = 3; c = -56;
Δ = b2-4ac
Δ = 32-4·5·(-56)
Δ = 1129
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{1129}}{2*5}=\frac{-3-\sqrt{1129}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{1129}}{2*5}=\frac{-3+\sqrt{1129}}{10} $
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