(b+45)+(2b-90)+(3/2b+b)+90=540

Solution for (b+45)+(2b-90)+(3/2b+b)+90=540 equation:

(b+45)+(2b-90)+(3/2b+b)+90=540

We move all terms to the left:

(b+45)+(2b-90)+(3/2b+b)+90-(540)=0


Domain of the equation: 2b+b)!=0

b∈R


We add all the numbers together, and all the variables

(b+45)+(2b-90)+(+b+3/2b)+90-540=0

We add all the numbers together, and all the variables

(b+45)+(2b-90)+(+b+3/2b)-450=0

We get rid of parentheses

b+2b+b+3/2b+45-90-450=0

We multiply all the terms by the denominator


b*2b+2b*2b+b*2b+45*2b-90*2b-450*2b+3=0

Wy multiply elements

2b^2+4b^2+2b^2+90b-180b-900b+3=0

We add all the numbers together, and all the variables

8b^2-990b+3=0

a = 8; b = -990; c = +3;
Δ = b2-4ac
Δ = -9902-4·8·3
Δ = 980004
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{980004}=\sqrt{4*245001}=\sqrt{4}*\sqrt{245001}=2\sqrt{245001}$
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-990)-2\sqrt{245001}}{2*8}=\frac{990-2\sqrt{245001}}{16}
$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-990)+2\sqrt{245001}}{2*8}=\frac{990+2\sqrt{245001}}{16}
$