(-x+6)(-5x-8)=0

Solution for (-x+6)(-5x-8)=0 equation:

(-x+6)(-5x-8)=0

We add all the numbers together, and all the variables

(-1x+6)(-5x-8)=0

We multiply parentheses ..

(+5x^2+8x-30x-48)=0

We get rid of parentheses

5x^2+8x-30x-48=0

We add all the numbers together, and all the variables

5x^2-22x-48=0

a = 5; b = -22; c = -48;
Δ = b2-4ac
Δ = -222-4·5·(-48)
Δ = 1444
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1444}=38$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-22)-38}{2*5}=\frac{-16}{10}
=-1+3/5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-22)+38}{2*5}=\frac{60}{10}
=6
$