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9x^2-7x-53=0
a = 9; b = -7; c = -53;
Δ = b2-4ac
Δ = -72-4·9·(-53)
Δ = 1957
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{-(-7)-\sqrt{1957}}{2*9}=\frac{7-\sqrt{1957}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{1957}}{2*9}=\frac{7+\sqrt{1957}}{18} $
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