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7n^2+9n+4=-4
We move all terms to the left:
7n^2+9n+4-(-4)=0
We add all the numbers together, and all the variables
7n^2+9n+8=0
a = 7; b = 9; c = +8;
Δ = b2-4ac
Δ = 92-4·7·8
Δ = -143
Delta is less than zero, so there is no solution for the equation
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