What is the minimum value of f(x) = x^2 - 4x - 21?
Answer and explanation
Correct answer: A. -25
- Step 1: The parabola opens upwards, so the minimum is at x = -b/(2a) = 2.
- Step 2: f(2) = -25.
Answer
-25.
Practise more Trigonometry, Sequences, Calculus and Data.
Free questions with an explanation for every one, and full timed Ontario Secondary School Diploma (OSSD) mock tests.
More Trigonometry, Sequences, Calculus and Data questions
- What is the exact value of cos 60 degrees?
- In triangle ABC, A = 40 degrees, B = 70 degrees and a = 8. What is b, to one decimal?
- Two sides of a triangle are 7 and 9 with a 60 degree angle between them. How long is the third side, to one decimal?
- Convert 150 degrees to radians.
- What is the period of y = 3 sin(4x)?
- Solve 2 sin x = sqrt(3) for 0 <= x < 2pi.