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X^2-30+45X=0
a = 1; b = 45; c = -30;
Δ = b2-4ac
Δ = 452-4·1·(-30)
Δ = 2145
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{-(45)-\sqrt{2145}}{2*1}=\frac{-45-\sqrt{2145}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(45)+\sqrt{2145}}{2*1}=\frac{-45+\sqrt{2145}}{2} $
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