Grade 8 maths · G.3 · Functions
Evaluate a quadratic function
Replace x with the number in the brackets and work it out.
Loading a question…
You've done today's 10 free questions.
Come back tomorrow for 10 more, or get unlimited practice with a membership.
Want more today? Print 20 more questions free, with the answers.
Already a member? Sign in.
See worked examples
f(x) = 2x² + 3. Find f(1).
Answer: 5
f(x) = 3x² + 9. Find f(4).
Answer: 57
f(x) = x² − 6. Find f(−2).
Answer: -2
Tip: Replace x with the number in the brackets and work it out.
Print a worksheet of this skill New questions and an answer key, free.
Up next
- Next in this topic Find the input for a given output Grade 8
- Ready for more Evaluate linear functions Grade 9
Print a free worksheet with answers (20 questions).
Practise without limits
Members practise as much as they like, every day, and get the printable packs and lessons too.