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7x^2=-49-42
We move all terms to the left:
7x^2-(-49-42)=0
We add all the numbers together, and all the variables
7x^2-(-91)=0
We add all the numbers together, and all the variables
7x^2+91=0
a = 7; b = 0; c = +91;
Δ = b2-4ac
Δ = 02-4·7·91
Δ = -2548
Delta is less than zero, so there is no solution for the equation
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