(0.70-x)(0.45-x)=0

Solution for (0.70-x)(0.45-x)=0 equation:

(0.70-x)(0.45-x)=0

We add all the numbers together, and all the variables

(-1x+0.7)(-1x+0.45)=0

We multiply parentheses ..

(+x^2-0.45x-0.7x+0.315)=0

We get rid of parentheses

x^2-0.45x-0.7x+0.315=0

We add all the numbers together, and all the variables

x^2-1.15x+0.315=0

a = 1; b = -1.15; c = +0.315;
Δ = b2-4ac
Δ = -1.152-4·1·0.315
Δ = 0.0625
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{-(-1.15)-\sqrt{0.0625}}{2*1}=\frac{1.15-\sqrt{0.0625}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.15)+\sqrt{0.0625}}{2*1}=\frac{1.15+\sqrt{0.0625}}{2}
$