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135x-15x^2=0
a = -15; b = 135; c = 0;
Δ = b2-4ac
Δ = 1352-4·(-15)·0
Δ = 18225
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{18225}=135$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(135)-135}{2*-15}=\frac{-270}{-30} =+9 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(135)+135}{2*-15}=\frac{0}{-30} =0 $
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