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Advanced MathEasyy-intercept of a quadratic

Advanced Math practice question

In the xy-plane, the graph of y = x² − 4x + 9 crosses the y-axis at (0, c). What is the value of c?

Answer: 9

On the y-axis x = 0, so y = 9 — the constant term.

Common wrong answers

If you answered 3
3 is the square root of 9; the intercept is the constant itself.
If you answered 5
5 is f(2), the vertex height, not the y-intercept.
If you answered -4
−4 is the x-coefficient; at x = 0 only the constant 9 remains.

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