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7x(5-3x)=0
We add all the numbers together, and all the variables
7x(-3x+5)=0
We multiply parentheses
-21x^2+35x=0
a = -21; b = 35; c = 0;
Δ = b2-4ac
Δ = 352-4·(-21)·0
Δ = 1225
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1225}=35$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(35)-35}{2*-21}=\frac{-70}{-42} =1+2/3 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(35)+35}{2*-21}=\frac{0}{-42} =0 $
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