Question

PLEASE HELP ME

Which of the following is an irrational number?
A ✓5
B -2
C 1/2
D ✓9​

Answer 1

Hello.

A rational number can be expressed as a fraction.

Let's check if we can express the given numbers as fractions.

The first number is √5.

Can we express √5 as a fraction? No.

Why? Because √5=2.236...

We cannot express this number as a fraction.

Thus, √5 is irrational.

Let's check the other 3 numbers.

The second number is -2.

Can we express -2 as a fraction? Sure!

`\displaystyle-(2)/(1)`

Thus, -2 is rational.

What about the third number?

Well, it's already a fraction.

Seems like Option A is the right option, huh? Well, let's check the last one as well.

The last one is √9.

9 does have a square root, unlike 5.

It equals 3:

√9=3

Let's express 3 as a fraction:

`\displaystyle(3)/(1)`

Therefore, Option A is the right option ;)

I hope it helps.

Have a great day.

`\boxed{imperturbability}`

Answer 2

A ✓5 is the irrational number.

Explanation:

Have a good day. :)