(7x+6)(x-1)=0

Solution for (7x+6)(x-1)=0 equation:

(7x+6)(x-1)=0

We multiply parentheses ..

(+7x^2-7x+6x-6)=0

We get rid of parentheses

7x^2-7x+6x-6=0

We add all the numbers together, and all the variables

7x^2-1x-6=0

a = 7; b = -1; c = -6;
Δ = b2-4ac
Δ = -12-4·7·(-6)
Δ = 169
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{169}=13$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-13}{2*7}=\frac{-12}{14}
=-6/7
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+13}{2*7}=\frac{14}{14}
=1
$