Question

Prove that (√7)3 is a irrational .

Answer 1

irrational number means there should be repeating number or root values.
here
$\sqrt{7 } \times 3$
$3 \sqrt{7}$
here there is a root values
so it is a irrational number.
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Answer 2

i think this will help you ....

if the first part is not clear refer this

to prove 3 root 7 is irrational ,

let us assume to the contrary that 3 root 7 is rational

i guess the rest is clear if not ask me in comments

pls mark brainliest if it helped