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5x(7x-3)=0
We multiply parentheses
35x^2-15x=0
a = 35; b = -15; c = 0;
Δ = b2-4ac
Δ = -152-4·35·0
Δ = 225
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{225}=15$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-15}{2*35}=\frac{0}{70} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+15}{2*35}=\frac{30}{70} =3/7 $
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