y-intercept of a polynomial

What this lesson shows

Where does 2 x squared, plus 2 x, minus 3 cross the y axis? It sounds like it needs a graph. It needs one number.

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Real questions from this lesson's worksheets — answers below each one.

1. As x → −∞, the end behavior of f(x) = 3x² + 2x - 1 is f(x) → ?
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   +∞
2. Find the y-intercept of f(x) = x² - 3x. Give the y-value.
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   0
3. Find the y-intercept of f(x) = x² + 4x + 6. Give the y-value.
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   6
4. As x → −∞, the end behavior of f(x) = x⁴ + 2x - 1 is f(x) → ?
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   +∞