7n^2-41n-56=0

Solution for 7n^2-41n-56=0 equation:

7n^2-41n-56=0

a = 7; b = -41; c = -56;
Δ = b2-4ac
Δ = -412-4·7·(-56)
Δ = 3249
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{3249}=57$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-41)-57}{2*7}=\frac{-16}{14}
=-1+1/7
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-41)+57}{2*7}=\frac{98}{14}
=7
$