Substitution (With negatives)

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Work out the value of each expression.

1.Find the value of 2ab − a² when a = 7 and b = 1.

2.Find the value of 6a² + 9b² when a = 1 and b = 8.

3.Find the value of ab − 3 when a = 8 and b = −6.

4.Find the value of ab + 4 when a = 6 and b = −4.

5.Find the value of a² + b² when a = 1 and b = 6.

6.Find the value of 5ab − a² when a = −3 and b = −2.

7.Find the value of 7(a − b) when a = 5 and b = 2.

8.Find the value of a³ − 7b when a = −3 and b = −2.

9.Find the value of a² + 6b when a = 4 and b = 9.

10.Find the value of a³ − 5b when a = −1 and b = 9.

11.Find the value of 8a − 3b when a = 4 and b = 7.

12.Find the value of ab − 6 when a = −6 and b = 3.

13.Find the value of 2(a − b) when a = −6 and b = 4.

14.Find the value of ab − 5 when a = 4 and b = −3.

15.Find the value of 7(a − b) when a = −3 and b = −1.

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Work out the value of each expression.

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