Question

2-√5 is a rational numbers​

Answer 1

Irrational. Sum of a rational and an irrational number is always irrational.

Proof by contradiction:

Let's say x is a rational no and y is an irrational no

Suppose: x+y is rational

Let x+y = z

So z is supposedly a rational no.

Now sum of 2 rational numbers is always rational.

Let's add -x to z, as x is rational so -x is also rational.

z-x = x+y-x = y

But we know that y is irrational.

Hence x+y must be irrational.

Hope it helps

Answer 2

Answer:

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Step-by-step explanation:

The numbers which are in the form of p/q where p and q both are integers . q is not equal to 0 . In the above statement √5 is not an integer , so it is not rational number . It is irrational number .