Question

prove that 2+root 7 is irrational

Answer 1

Step-by-step explanation:

Let us assume that 2/√7 is rational number.

2/√7×√7×√7=2√7/7 is rational number

which is only possible is2/√7is rational and

√7 is rational.

But the fact is √7 is irrational.

which contradicts to our assumption.

2/√7 is an irrational number