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Substitution

Stuck? Read the notes

	Answers
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If a = 5,\ b = -4,\ c = -4,\ d = 12 , evaluate without a calculator the expressions below.

1. ad
2. 5a
3. 2a^{2}
4. \left( 2a \right)^{2}
5. ab
6. bc
7. 3a + b
8. bd -c
9. b^{3}
10. abc
11. cd -ab
12. 3b + 4d