n2+10n-12=7n+6

Solution for n2+10n-12=7n+6 equation:

n2+10n-12=7n+6

We move all terms to the left:

n2+10n-12-(7n+6)=0

We add all the numbers together, and all the variables

n^2+10n-(7n+6)-12=0

We get rid of parentheses

n^2+10n-7n-6-12=0

We add all the numbers together, and all the variables

n^2+3n-18=0

a = 1; b = 3; c = -18;
Δ = b2-4ac
Δ = 32-4·1·(-18)
Δ = 81
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{81}=9$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-9}{2*1}=\frac{-12}{2}
=-6
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+9}{2*1}=\frac{6}{2}
=3
$