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-8(r2)=40
We move all terms to the left:
-8(r2)-(40)=0
We add all the numbers together, and all the variables
-8r^2-40=0
a = -8; b = 0; c = -40;
Δ = b2-4ac
Δ = 02-4·(-8)·(-40)
Δ = -1280
Delta is less than zero, so there is no solution for the equation
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