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5(10x^2)=5x+9
We move all terms to the left:
5(10x^2)-(5x+9)=0
We get rid of parentheses
510x^2-5x-9=0
a = 510; b = -5; c = -9;
Δ = b2-4ac
Δ = -52-4·510·(-9)
Δ = 18385
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-\sqrt{18385}}{2*510}=\frac{5-\sqrt{18385}}{1020} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{18385}}{2*510}=\frac{5+\sqrt{18385}}{1020} $
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