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2x^2+2x=72
We move all terms to the left:
2x^2+2x-(72)=0
a = 2; b = 2; c = -72;
Δ = b2-4ac
Δ = 22-4·2·(-72)
Δ = 580
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{580}=\sqrt{4*145}=\sqrt{4}*\sqrt{145}=2\sqrt{145}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{145}}{2*2}=\frac{-2-2\sqrt{145}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{145}}{2*2}=\frac{-2+2\sqrt{145}}{4} $
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