(x-5)3x=7

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Solution for (x-5)3x=7 equation:



(x-5)3x=7
We move all terms to the left:
(x-5)3x-(7)=0
We multiply parentheses
3x^2-15x-7=0
a = 3; b = -15; c = -7;
Δ = b2-4ac
Δ = -152-4·3·(-7)
Δ = 309
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-\sqrt{309}}{2*3}=\frac{15-\sqrt{309}}{6} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{309}}{2*3}=\frac{15+\sqrt{309}}{6} $

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