Question

9. Simplify these expressions and find their values if x = 3 , a = - 1, b = - 2
i)4x-5-x+9
ii) 2a - 2b - 4 - 5 + a​

Answer 1

Answer:

1)

4(3)-5-3+9

12-8+9

=13

2)

2(-1)-2(-2)-4-5+(-1)

-2+4-9-1

-8

Answer 2

Answer:

Required Answers :-

i)4x-5-x+9

$4x - 5 - x + 9$

$= 4(3) - 5 - (3) + 9$

$= 12 - 5 - 3 + 9$

$= 12 - 8 + 9$

$= 12 + 1$

$= 13$

ii) 2a - 2b - 4 - 5 + a

$2a - 2b - 4 - 5 + a$

$= 2( - 1) - 2( - 2) - 4 - 5 + ( - 1)$

$= - 2 + 4 - 9 - 1$

$= 2 - 10$

$= - 8$