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.
More Advanced Math questions
- Easy
If f(x) = 3x − 7, what is the value of f(5)? - Easy
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Which of the following expressions is equivalent to x² + 7x + 12 ? - Easy
The function g is defined by g(x) = x³ + 2x. What is the value of g(−2) ? - Easy
For x > 0, which of the following is equivalent to ∛(x⁵) ? - Easy
The function h is defined by h(x) = (x − 6)(x + 2). What is one value of x for which h(x) = 0 ?
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