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(2x+5)x=260
We move all terms to the left:
(2x+5)x-(260)=0
We multiply parentheses
2x^2+5x-260=0
a = 2; b = 5; c = -260;
Δ = b2-4ac
Δ = 52-4·2·(-260)
Δ = 2105
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{2105}}{2*2}=\frac{-5-\sqrt{2105}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{2105}}{2*2}=\frac{-5+\sqrt{2105}}{4} $
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