Question

Simplify the expressions and find the value when a = 4
6) 4a + 3 ( a – 3)
7) 2 ( 3a – 1) + 2a + 10
8) a + 4 + 4 ( a – 3)

Answer 1

(6) 4a+3a-9

= 7a-9

Putting a = 4

= 7×4-9

= 28-9

= 19

(7) 6a-2+2a+10

= 8a+8

Putting a = 4

= 8×4+8

= 32+8

= 40

(8) a+4+4a-12

= 5a-8

Putting a = 4

= 5×4-8

= 20-8

= 12