3.2x2=7.5x

Solution for 3.2x2=7.5x equation:

3.2x^2=7.5x

We move all terms to the left:

3.2x^2-(7.5x)=0

We add all the numbers together, and all the variables

3.2x^2-(+7.5x)=0

We get rid of parentheses

3.2x^2-7.5x=0

a = 3.2; b = -7.5; c = 0;
Δ = b2-4ac
Δ = -7.52-4·3.2·0
Δ = 56.25
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7.5)-\sqrt{56.25}}{2*3.2}=\frac{7.5-\sqrt{56.25}}{6.4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7.5)+\sqrt{56.25}}{2*3.2}=\frac{7.5+\sqrt{56.25}}{6.4}
$