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(4-x)^2-(3x+1)(4-x)=0
We add all the numbers together, and all the variables
(-1x+4)^2-(3x+1)(-1x+4)=0
We multiply parentheses ..
-(-3x^2+12x-1x+4)+(-1x+4)^2=0
We get rid of parentheses
3x^2-12x+1x+(-1x+4)^2-4=0
We add all the numbers together, and all the variables
3x^2-11x+(-1x+4)^2-4=0
We move all terms containing x to the left, all other terms to the right
3x^2-11x+(-1x+4)^2=4
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