s+21/2s+10s=45

Solution for s+21/2s+10s=45 equation:

s+21/2s+10s=45

We move all terms to the left:

s+21/2s+10s-(45)=0


Domain of the equation: 2s!=0

s!=0/2

s!=0

s∈R


We add all the numbers together, and all the variables

11s+21/2s-45=0

We multiply all the terms by the denominator


11s*2s-45*2s+21=0

Wy multiply elements

22s^2-90s+21=0

a = 22; b = -90; c = +21;
Δ = b2-4ac
Δ = -902-4·22·21
Δ = 6252
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{6252}=\sqrt{4*1563}=\sqrt{4}*\sqrt{1563}=2\sqrt{1563}$
$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-90)-2\sqrt{1563}}{2*22}=\frac{90-2\sqrt{1563}}{44}
$
$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-90)+2\sqrt{1563}}{2*22}=\frac{90+2\sqrt{1563}}{44}
$