1/2x-3/4x-8=-7

Solution for 1/2x-3/4x-8=-7 equation:

1/2x-3/4x-8=-7

We move all terms to the left:

1/2x-3/4x-8-(-7)=0


Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R



Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R


We add all the numbers together, and all the variables

1/2x-3/4x-1=0

We calculate fractions


4x/8x^2+(-6x)/8x^2-1=0

We multiply all the terms by the denominator


4x+(-6x)-1*8x^2=0

Wy multiply elements

-8x^2+4x+(-6x)=0

We get rid of parentheses

-8x^2+4x-6x=0

We add all the numbers together, and all the variables

-8x^2-2x=0

a = -8; b = -2; c = 0;
Δ = b2-4ac
Δ = -22-4·(-8)·0
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{4}=2$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2}{2*-8}=\frac{0}{-16}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2}{2*-8}=\frac{4}{-16}
=-1/4
$