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-a2+9=13
We move all terms to the left:
-a2+9-(13)=0
We add all the numbers together, and all the variables
-1a^2-4=0
a = -1; b = 0; c = -4;
Δ = b2-4ac
Δ = 02-4·(-1)·(-4)
Δ = -16
Delta is less than zero, so there is no solution for the equation
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