First Year maths · N.12 · Simplify expressions
Evaluate linear expressions with negative values
Replace each letter with its value. Put parentheses around negative values.
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See worked examples
Evaluate −x − 1 when x = 3.
Answer: -4
Evaluate x + 5 when x = 3.
Answer: 8
Evaluate −4x − 5 when x = −2.
Answer: 3
Tip: Replace each letter with its value. Put parentheses around negative values.
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