(7/5)x-7=2.8

Solution for (7/5)x-7=2.8 equation:

(7/5)x-7=2.8

We move all terms to the left:

(7/5)x-7-(2.8)=0


Domain of the equation: 5)x!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

(+7/5)x-7-(2.8)=0

We add all the numbers together, and all the variables

(+7/5)x-9.8=0

We multiply parentheses

7x^2-9.8=0

a = 7; b = 0; c = -9.8;
Δ = b2-4ac
Δ = 02-4·7·(-9.8)
Δ = 274.4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{274.4}}{2*7}=\frac{0-\sqrt{274.4}}{14}
=-\frac{\sqrt{}}{14}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{274.4}}{2*7}=\frac{0+\sqrt{274.4}}{14}
=\frac{\sqrt{}}{14}
$