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x2+4x-5x^2-16=0
We add all the numbers together, and all the variables
-4x^2+4x-16=0
a = -4; b = 4; c = -16;
Δ = b2-4ac
Δ = 42-4·(-4)·(-16)
Δ = -240
Delta is less than zero, so there is no solution for the equation
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