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(0.25-0.4x)(0.55-0.4x)=x*2
We move all terms to the left:
(0.25-0.4x)(0.55-0.4x)-(x*2)=0
We add all the numbers together, and all the variables
(-0.4x+0.25)(-0.4x+0.55)-(+x*2)=0
We get rid of parentheses
(-0.4x+0.25)(-0.4x+0.55)-x*2=0
We multiply parentheses ..
(+0x^2+0x+0x+0.1375)-x*2=0
Wy multiply elements
(+0x^2+0x+0x+0.1375)-2x=0
We get rid of parentheses
0x^2+0x+0x-2x+0.1375=0
We add all the numbers together, and all the variables
x^2+0.1375=0
a = 1; b = 0; c = +0.1375;
Δ = b2-4ac
Δ = 02-4·1·0.1375
Δ = -0.55
Delta is less than zero, so there is no solution for the equation
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