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8x^2+12=-9
We move all terms to the left:
8x^2+12-(-9)=0
We add all the numbers together, and all the variables
8x^2+21=0
a = 8; b = 0; c = +21;
Δ = b2-4ac
Δ = 02-4·8·21
Δ = -672
Delta is less than zero, so there is no solution for the equation
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