evaluate each expression when a =4, b = 3 and y = -1.
1. 3a + 4b
2. -2by + 4a + 1
3. 2 (2ab-2)
4. 4ab - 2by - 5
5. (a - 2) (b - y)
1. 3a + 4b
2. -2by + 4a + 1
3. 2 (2ab-2)
4. 4ab - 2by - 5
5. (a - 2) (b - y)
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SOLUTION:
1. 3a + 4b
= 3 (4) + 4 (3)
= 12 + 12
= 24
2. -2by + 4a + 1
= -2 (3) (-1) + 4 (4) + 1
= 6 + 16 + 1
23
3. 2 (2ab - 2)
= 2 (2 (4) (3) - 2)
= 2 (24 - 2)
= 2(22)
= 44
4. 4ab - 2by - 5
= 4 (4) (3) - 2 (4) (-1) - 5
= 48 - (-8) - 5
= 49
5. (a - 2) (b - y)
= (4 - 2) (3 - (-1))
= (2) (4)
= 8
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