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-5x^2+40x+60=0
a = -5; b = 40; c = +60;
Δ = b2-4ac
Δ = 402-4·(-5)·60
Δ = 2800
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{2800}=\sqrt{400*7}=\sqrt{400}*\sqrt{7}=20\sqrt{7}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(40)-20\sqrt{7}}{2*-5}=\frac{-40-20\sqrt{7}}{-10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(40)+20\sqrt{7}}{2*-5}=\frac{-40+20\sqrt{7}}{-10} $
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