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x(-4.9x+75)=0
We multiply parentheses
-4x^2+75x=0
a = -4; b = 75; c = 0;
Δ = b2-4ac
Δ = 752-4·(-4)·0
Δ = 5625
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{5625}=75$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(75)-75}{2*-4}=\frac{-150}{-8} =18+3/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(75)+75}{2*-4}=\frac{0}{-8} =0 $
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