Class 8 maths · G.2 · Functions
Evaluate a linear function
Replace x with the number in the brackets and work it out.
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See worked examples
f(x) = −2x − 6. Find f(5).
Answer: -16
f(x) = 6x + 2. Find f(4).
Answer: 26
f(x) = 5x + 3. Find f(−6).
Answer: -27
Tip: Replace x with the number in the brackets and work it out.
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