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6x(x+15)=0
We multiply parentheses
6x^2+90x=0
a = 6; b = 90; c = 0;
Δ = b2-4ac
Δ = 902-4·6·0
Δ = 8100
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{8100}=90$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(90)-90}{2*6}=\frac{-180}{12} =-15 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(90)+90}{2*6}=\frac{0}{12} =0 $
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