4/7x+1/4x=4

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

4/7x+1/4x=4

We move all terms to the left:

4/7x+1/4x-(4)=0


Domain of the equation: 7x!=0

x!=0/7

x!=0

x∈R



Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R


We calculate fractions


16x/28x^2+7x/28x^2-4=0

We multiply all the terms by the denominator


16x+7x-4*28x^2=0

We add all the numbers together, and all the variables

23x-4*28x^2=0

Wy multiply elements

-112x^2+23x=0

a = -112; b = 23; c = 0;
Δ = b2-4ac
Δ = 232-4·(-112)·0
Δ = 529
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{529}=23$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(23)-23}{2*-112}=\frac{-46}{-224}
=23/112
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(23)+23}{2*-112}=\frac{0}{-224}
=0
$