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5x(x-7)=20
We move all terms to the left:
5x(x-7)-(20)=0
We multiply parentheses
5x^2-35x-20=0
a = 5; b = -35; c = -20;
Δ = b2-4ac
Δ = -352-4·5·(-20)
Δ = 1625
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1625}=\sqrt{25*65}=\sqrt{25}*\sqrt{65}=5\sqrt{65}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-35)-5\sqrt{65}}{2*5}=\frac{35-5\sqrt{65}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-35)+5\sqrt{65}}{2*5}=\frac{35+5\sqrt{65}}{10} $
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