Question

Select all the equations that have rational number
x³=8
x³=16
x³=27
x³=64

Answer 1

x³=8

x³=27

x³=64

Explanation:

A rational number is one formed by dividing integers. This means a rational number can be expressed as a ratio of two integers. Examples of rational numbers are;

• 1/3 ------------------formed from ratio of 1 to 3 or 1 divided by 3
• 0.75-----------------formed from ratio of 3 to 4 or 3/4
• 4----------------------formed from the 4/1
• 3.45------------------formed from 345/100
• -2.5------------------formed from -25/10

Given in the question;

x³=8 ----- x=∛8 = 2 -------can be formed from 2/1 ⇒ equation has rational number

x³=16 -----x=∛16 = 2.5198421 ----- irrational

x³=27-------x=∛27 = 3--------rational

x³=64------x=∛64 =4---------rational