(4w-5)(3-w)=0

Solution for (4w-5)(3-w)=0 equation:

(4w-5)(3-w)=0

We add all the numbers together, and all the variables

(4w-5)(-1w+3)=0

We multiply parentheses ..

(-4w^2+12w+5w-15)=0

We get rid of parentheses

-4w^2+12w+5w-15=0

We add all the numbers together, and all the variables

-4w^2+17w-15=0

a = -4; b = 17; c = -15;
Δ = b2-4ac
Δ = 172-4·(-4)·(-15)
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{49}=7$
$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(17)-7}{2*-4}=\frac{-24}{-8}
=+3
$
$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(17)+7}{2*-4}=\frac{-10}{-8}
=1+1/4
$