3/7u+5/2u=1

Solution for 3/7u+5/2u=1 equation:

3/7u+5/2u=1

We move all terms to the left:

3/7u+5/2u-(1)=0


Domain of the equation: 7u!=0

u!=0/7

u!=0

u∈R



Domain of the equation: 2u!=0

u!=0/2

u!=0

u∈R


We calculate fractions


6u/14u^2+35u/14u^2-1=0

We multiply all the terms by the denominator


6u+35u-1*14u^2=0

We add all the numbers together, and all the variables

41u-1*14u^2=0

Wy multiply elements

-14u^2+41u=0

a = -14; b = 41; c = 0;
Δ = b2-4ac
Δ = 412-4·(-14)·0
Δ = 1681
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1681}=41$
$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(41)-41}{2*-14}=\frac{-82}{-28}
=2+13/14
$
$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(41)+41}{2*-14}=\frac{0}{-28}
=0
$