1/2x+7/4x=9

Solution for 1/2x+7/4x=9 equation:

1/2x+7/4x=9

We move all terms to the left:

1/2x+7/4x-(9)=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 calculate fractions


4x/8x^2+14x/8x^2-9=0

We multiply all the terms by the denominator


4x+14x-9*8x^2=0

We add all the numbers together, and all the variables

18x-9*8x^2=0

Wy multiply elements

-72x^2+18x=0

a = -72; b = 18; c = 0;
Δ = b2-4ac
Δ = 182-4·(-72)·0
Δ = 324
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{324}=18$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(18)-18}{2*-72}=\frac{-36}{-144}
=1/4
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18)+18}{2*-72}=\frac{0}{-144}
=0
$