Year 6 maths · M.6 · Expressions and Variables
Evaluate expressions with one variable for a given value
Put the given number in place of the letter, then multiply before you add or subtract.
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See worked examples
f(x) = 4x − 6. Find f(−2).
Answer: -14
f(x) = −x + 5. Find f(−4).
Answer: 9
f(x) = −4x. Find f(−5).
Answer: 20
Tip: Put the given number in place of the letter, then multiply before you add or subtract.
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