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(20-b)(2+b)=800
We move all terms to the left:
(20-b)(2+b)-(800)=0
We add all the numbers together, and all the variables
(-1b+20)(b+2)-800=0
We multiply parentheses ..
(-1b^2-2b+20b+40)-800=0
We get rid of parentheses
-1b^2-2b+20b+40-800=0
We add all the numbers together, and all the variables
-1b^2+18b-760=0
a = -1; b = 18; c = -760;
Δ = b2-4ac
Δ = 182-4·(-1)·(-760)
Δ = -2716
Delta is less than zero, so there is no solution for the equation
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