Question

1. Simplify the following expression: 4a - 5 + 3a - b - 3 + 2b

2. Evalute the expression if a=3 and b=7

Answer 1

1. Simplified: 7a + b - 8

2. Evaluated: 20

Explanation:

4a - 5 + 3a - b - 3 + 2b =

4a + 3a - b + 2b - 5 - 3 =

7a + b - 8

7a + b - 8 = 7 * 3 + 7 - 8 = 21 + 7 - 8 = 20

Answer 2

20

Explanation:

If a=3, b=7,

4a-5+3a-b-3+2b

= 4(3)-5+3(3)-7-3+2(7)

= 12-5+9-7-3+14

= 20