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2(4-2r)=-4r(r+2)
We move all terms to the left:
2(4-2r)-(-4r(r+2))=0
We add all the numbers together, and all the variables
2(-2r+4)-(-4r(r+2))=0
We multiply parentheses
-4r-(-4r(r+2))+8=0
We calculate terms in parentheses: -(-4r(r+2)), so:We get rid of parentheses
-4r(r+2)
We multiply parentheses
-4r^2-8r
Back to the equation:
-(-4r^2-8r)
4r^2+8r-4r+8=0
We add all the numbers together, and all the variables
4r^2+4r+8=0
a = 4; b = 4; c = +8;
Δ = b2-4ac
Δ = 42-4·4·8
Δ = -112
Delta is less than zero, so there is no solution for the equation
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