Find the minimum value of .
Answer and explanation
Correct answer: D. -3
- Step 1: Complete the square: .
- Step 2: A square is at least , so the minimum value is .
Answer
-3.
Why not the others: 33: that is the constant term, not the minimum value. 3: the sign of the minimum is reversed. -9: it adds the shift to the minimum.
Practise more Number and Algebra.
Free questions with an explanation for every one, and full timed Junior Cycle (Ireland) mock tests.