Answer:
[tex]\sqrt{2}[/tex]
Step-by-step explanation:
the other 3 are perfect squares and have rational answers.
[tex]\sqrt{1.44} =1.2\\\sqrt{1}= 1\\\sqrt{4} =2[/tex]
A square root of any number that won't result in a whole number is irrational.
In this case, [tex]\sqrt{2}[/tex] is irrational.
