Advanced MathMediumX-intercepts of a quadratic function
Advanced Math practice question
The function f is defined by f(x) = x² − 6x + 5. At which values of x does the graph of f cross the x-axis?
- A. x = 1 and x = 5Correct
- B. x = −1 and x = −5
- C. x = 2 and x = 3
- D. x = 0 and x = 5
Answer: A. x = 1 and x = 5
x² − 6x + 5 = (x − 1)(x − 5).
Why the other answers are wrong
- B. x = −1 and x = −5
- (x + 1)(x + 5) would give x² + 6x + 5.
- C. x = 2 and x = 3
- (x − 2)(x − 3) would give x² − 5x + 6.
- D. x = 0 and x = 5
- f(0) = 5, not 0.
More Advanced Math questions
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What are the solutions to x² − 5x + 6 = 0? - Medium
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What are the solutions to x² + 6x + 8 = 0?
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