2x2+14x=7x+4

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Solution for 2x2+14x=7x+4 equation:



2x^2+14x=7x+4
We move all terms to the left:
2x^2+14x-(7x+4)=0
We get rid of parentheses
2x^2+14x-7x-4=0
We add all the numbers together, and all the variables
2x^2+7x-4=0
a = 2; b = 7; c = -4;
Δ = b2-4ac
Δ = 72-4·2·(-4)
Δ = 81
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{81}=9$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-9}{2*2}=\frac{-16}{4} =-4 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+9}{2*2}=\frac{2}{4} =1/2 $

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