Question

-√7 иррациональное число?

Answer 1

да, любое простое число под корнем будет считаться иррациаональным

Answer 2

Yes, the number -√7 is irrational. An irrational number is a real number that cannot be expressed as a fraction of two integers and whose decimal representation goes on infinitely without repeating.

The square root of 7 (√7) is already known to be irrational, and adding a negative sign to it does not change its irrationality. So, -√7 is also an irrational number.