7x^2-5x-2=-1

Solution for 7x^2-5x-2=-1 equation:

7x^2-5x-2=-1

We move all terms to the left:

7x^2-5x-2-(-1)=0

We add all the numbers together, and all the variables

7x^2-5x-1=0

a = 7; b = -5; c = -1;
Δ = b2-4ac
Δ = -52-4·7·(-1)
Δ = 53
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{-(-5)-\sqrt{53}}{2*7}=\frac{5-\sqrt{53}}{14}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{53}}{2*7}=\frac{5+\sqrt{53}}{14}
$