(5/7)x=55

Solution for (5/7)x=55 equation:

(5/7)x=55

We move all terms to the left:

(5/7)x-(55)=0


Domain of the equation: 7)x!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

(+5/7)x-55=0

We multiply parentheses

5x^2-55=0

a = 5; b = 0; c = -55;
Δ = b2-4ac
Δ = 02-4·5·(-55)
Δ = 1100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1100}=\sqrt{100*11}=\sqrt{100}*\sqrt{11}=10\sqrt{11}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-10\sqrt{11}}{2*5}=\frac{0-10\sqrt{11}}{10}
=-\frac{10\sqrt{11}}{10}
=-\sqrt{11}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+10\sqrt{11}}{2*5}=\frac{0+10\sqrt{11}}{10}
=\frac{10\sqrt{11}}{10}
=\sqrt{11}
$