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-7x(5x+6)=0
We multiply parentheses
-35x^2-42x=0
a = -35; b = -42; c = 0;
Δ = b2-4ac
Δ = -422-4·(-35)·0
Δ = 1764
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{1764}=42$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-42)-42}{2*-35}=\frac{0}{-70} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-42)+42}{2*-35}=\frac{84}{-70} =-1+1/5 $
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