Find the range of y = - 2 divided by x square + 2x-1 | Math enthusiast | Mathematical art

Find the range of y = - 2 divided by x square + 2x-1

g（x）=x^2+2x-1=（x+1）^2-2
So the range of G (x) is [- 2, + ∞)
Because y = - 2 / g (x), G (x) ≠ 0
When G (x) > 0, y

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