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(4x+1)*2x=26
We move all terms to the left:
(4x+1)*2x-(26)=0
We multiply parentheses
8x^2+2x-26=0
a = 8; b = 2; c = -26;
Δ = b2-4ac
Δ = 22-4·8·(-26)
Δ = 836
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{836}=\sqrt{4*209}=\sqrt{4}*\sqrt{209}=2\sqrt{209}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{209}}{2*8}=\frac{-2-2\sqrt{209}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{209}}{2*8}=\frac{-2+2\sqrt{209}}{16} $
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