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3x*x=40+5x
We move all terms to the left:
3x*x-(40+5x)=0
We add all the numbers together, and all the variables
3x*x-(5x+40)=0
Wy multiply elements
3x^2-(5x+40)=0
We get rid of parentheses
3x^2-5x-40=0
a = 3; b = -5; c = -40;
Δ = b2-4ac
Δ = -52-4·3·(-40)
Δ = 505
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{-(-5)-\sqrt{505}}{2*3}=\frac{5-\sqrt{505}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{505}}{2*3}=\frac{5+\sqrt{505}}{6} $
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