Question

1. If x =3, find the value of: ) 2x 3 (ii) x - 1​

Answer 1

Answer:

Let us substitute x=−3 in the given expression 2x−3 as shown below:

2x−3=[2×(−3)]−3=−6−3=−9

Hence, 2x−3=−9 if x=−3.

Answer 2

Answer:

a ) 54

b ) 3

Justification :

Given that ;

Value :

x = 3

a ) 2x³

Substitute x value :

2x³

2 ( 3 )³

2 ( 27 )

54

b ) x - 1

Substitute x value :

x - 1

3 - 1

3