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2x^2+2x-40=21
We move all terms to the left:
2x^2+2x-40-(21)=0
We add all the numbers together, and all the variables
2x^2+2x-61=0
a = 2; b = 2; c = -61;
Δ = b2-4ac
Δ = 22-4·2·(-61)
Δ = 492
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{492}=\sqrt{4*123}=\sqrt{4}*\sqrt{123}=2\sqrt{123}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{123}}{2*2}=\frac{-2-2\sqrt{123}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{123}}{2*2}=\frac{-2+2\sqrt{123}}{4} $
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