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(4x+5)*x-520=0
We multiply parentheses
4x^2+5x-520=0
a = 4; b = 5; c = -520;
Δ = b2-4ac
Δ = 52-4·4·(-520)
Δ = 8345
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{8345}}{2*4}=\frac{-5-\sqrt{8345}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{8345}}{2*4}=\frac{-5+\sqrt{8345}}{8} $
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