If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(0.8-x)(0.4-x)=0
We add all the numbers together, and all the variables
(-1x+0.8)(-1x+0.4)=0
We multiply parentheses ..
(+x^2-0.4x-0.8x+0.32)=0
We get rid of parentheses
x^2-0.4x-0.8x+0.32=0
We add all the numbers together, and all the variables
x^2-1.2x+0.32=0
a = 1; b = -1.2; c = +0.32;
Δ = b2-4ac
Δ = -1.22-4·1·0.32
Δ = 0.16
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{-(-1.2)-\sqrt{0.16}}{2*1}=\frac{1.2-\sqrt{0.16}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.2)+\sqrt{0.16}}{2*1}=\frac{1.2+\sqrt{0.16}}{2} $
| 3a-15=6a=3 | | o23+2=837218738913 | | -5(5-2n)=-85 | | x/6=15-7 | | p+3892=21 | | 3=-1/2c | | 8+5x=6x-7 | | 4y-9=-13 | | r2+932=3 | | 4(x-5)-2x+4=16 | | a/8+3=-1 | | 9y+3=-15 | | 100000p+391202180432901098=312377981237987989781278397891789 | | z/7-6=1 | | p+123=32998 | | 1/3(9x-12)=2x+1 | | 3=e | | -y-3=-4 | | 9x-6=47 | | -8y-6=58 | | 3(4y-9+6)=2y-12+y | | 6v^2-12v+3=0 | | 9y-3=-84 | | 7v-6-8v=-34 | | 23+0.10x=0.14x | | 5y+5=-35 | | 3n=7=25 | | x-(-7.68)=74.56 | | 13=p+(-1) | | 21-7x=35 | | 3.25-6b=1.5+2.75b | | 5(x-8)/6=7 |