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15x^2=-9
We move all terms to the left:
15x^2-(-9)=0
We add all the numbers together, and all the variables
15x^2+9=0
a = 15; b = 0; c = +9;
Δ = b2-4ac
Δ = 02-4·15·9
Δ = -540
Delta is less than zero, so there is no solution for the equation
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