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2a^2=-72
We move all terms to the left:
2a^2-(-72)=0
We add all the numbers together, and all the variables
2a^2+72=0
a = 2; b = 0; c = +72;
Δ = b2-4ac
Δ = 02-4·2·72
Δ = -576
Delta is less than zero, so there is no solution for the equation
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