7x2-5x=2

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Solution for 7x2-5x=2 equation:



7x^2-5x=2
We move all terms to the left:
7x^2-5x-(2)=0
a = 7; b = -5; c = -2;
Δ = b2-4ac
Δ = -52-4·7·(-2)
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{-(-5)-9}{2*7}=\frac{-4}{14} =-2/7 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+9}{2*7}=\frac{14}{14} =1 $

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