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Substitution, equivalent expressions and quadratic identities.
Free examples and worked answers. No account needed.
Practise the method.
Substitution, equivalent expressions and quadratic identities.
Substitution, equivalent expressions and quadratic identities.
Example 1
Evaluate 5x+2 when x=2.
Show worked answer
Answer: 12
- Substitute 2.
- 5×2+2=12.
Example 2
Evaluate 6x+5y when x=8 and y=2.
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Answer: 58
- Substitute both values.
- 6×8+5×2=58.
Example 3
Evaluate 7x+3 when x=3.
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Answer: 24
- Substitute 3.
- 7×3+3=24.
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