1/2x-7=x+9

Solution for 1/2x-7=x+9 equation:

1/2x-7=x+9

We move all terms to the left:

1/2x-7-(x+9)=0


Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R


We get rid of parentheses

1/2x-x-9-7=0

We multiply all the terms by the denominator


-x*2x-9*2x-7*2x+1=0

Wy multiply elements

-2x^2-18x-14x+1=0

We add all the numbers together, and all the variables

-2x^2-32x+1=0

a = -2; b = -32; c = +1;
Δ = b2-4ac
Δ = -322-4·(-2)·1
Δ = 1032
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:

$\sqrt{\Delta}=\sqrt{1032}=\sqrt{4*258}=\sqrt{4}*\sqrt{258}=2\sqrt{258}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-32)-2\sqrt{258}}{2*-2}=\frac{32-2\sqrt{258}}{-4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-32)+2\sqrt{258}}{2*-2}=\frac{32+2\sqrt{258}}{-4}
$