Algebraic expressions

The expression for ‘ 1 added to 2 p’ is

• 2 p + 1

• 2 p – 1

• – 1 – 2p

• – 1 – 2p

If Apala’s present age is x years, what will be her age in years after 20 years from now?

• 20 - x

• x - 20

• x/20

• x + 20

Which of the following is an equation in a variable?

• 10/2 =5

• 2 × 3 + 2 × 1 = 8

• 2 × 4 = 8

• 3 p = 12.

If a = 2 and b = 3, find the value of

2 a − 3 b

• 4

• 5

• 2

• -5

If x = 1, y = 2 and z = 5, find the value of

3 x − 2 y + 4 z

• 11

• 13

• 19

• 27

If p = −2, q = −1 and r = 3, find the value of p − q − r

• 4

• -4

• 3

• 8

Add : 7 x y z, − 5 x y z, 9 x y z, −8 x y z

• 11 x y z

• 8 x y z

• 3 x y z

• 33 x y z

Add : 8 a − 6 ab + 5 b, −6 a − ab − 8 b, −4 a + 2 ab + 3 b

• 5 a + 7 b

• 2 a - 7 b

• -2 a - 5 ab

• 2 a + 5 ab

Subtract −2 a + b + 6 d from 5 a − 2 b − 3 c.

• 7 a − 3 b - 9 c

• 7 a + 3 b - 3 c - 6 d

• 7 a − 3 b - 3 c - 6 d

• 7 a − 3 b - 6 d

Simplify:

4 x − (3 y − x + 2 z)

• 15 x − 3 y − 24 z

• 5 x − 3 y + 2 z

• 5 x + 3 y − 2 z

• 5 x − 3 y − 2 z