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=A^2-10A+300
We move all terms to the left:
-(A^2-10A+300)=0
We get rid of parentheses
-A^2+10A-300=0
We add all the numbers together, and all the variables
-1A^2+10A-300=0
a = -1; b = 10; c = -300;
Δ = b2-4ac
Δ = 102-4·(-1)·(-300)
Δ = -1100
Delta is less than zero, so there is no solution for the equation
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