7x^2-4x-5=-5

Solution for 7x^2-4x-5=-5 equation:

7x^2-4x-5=-5

We move all terms to the left:

7x^2-4x-5-(-5)=0

We add all the numbers together, and all the variables

7x^2-4x=0

a = 7; b = -4; c = 0;
Δ = b2-4ac
Δ = -42-4·7·0
Δ = 16
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{16}=4$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-4}{2*7}=\frac{0}{14}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+4}{2*7}=\frac{8}{14}
=4/7
$