Question

If x = 3, find the value of the following:
(i) x + 5
(ii) 2x – 3
(iii) x – 7
(iv) x3 – 1

Answer 1

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

Step-by-step explanation:

For, x = 3

(i) x + 5

=> 3 + 5 = 8

(ii) 2x - 3

=> 2(3) - 3 = 6-3 = 3

(iii) x - 7

=> 3 - 7 = -4

(iv) x³ - 1

=> (3)³ - 1

=> 27 - 1 = 26