(2x+1)(x)=105

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Solution for (2x+1)(x)=105 equation:



(2x+1)(x)=105
We move all terms to the left:
(2x+1)(x)-(105)=0
We multiply parentheses
2x^2+x-105=0
a = 2; b = 1; c = -105;
Δ = b2-4ac
Δ = 12-4·2·(-105)
Δ = 841
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{841}=29$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-29}{2*2}=\frac{-30}{4} =-7+1/2 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+29}{2*2}=\frac{28}{4} =7 $

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