1/2x+7x=5

Solution for 1/2x+7x=5 equation:

1/2x+7x=5

We move all terms to the left:

1/2x+7x-(5)=0


Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R


We add all the numbers together, and all the variables

7x+1/2x-5=0

We multiply all the terms by the denominator


7x*2x-5*2x+1=0

Wy multiply elements

14x^2-10x+1=0

a = 14; b = -10; c = +1;
Δ = b2-4ac
Δ = -102-4·14·1
Δ = 44
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:

$\sqrt{\Delta}=\sqrt{44}=\sqrt{4*11}=\sqrt{4}*\sqrt{11}=2\sqrt{11}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{11}}{2*14}=\frac{10-2\sqrt{11}}{28}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{11}}{2*14}=\frac{10+2\sqrt{11}}{28}
$