Question

Identify the following as rational or irrational (√11 +√7) (√11 -√7)​

Answer 1

Answer:

Rational

Step-by-step explanation:

because

(√11+√7)(√11-√7)

{If there is no sign in between two brackets then consider multiplication between the two brackets}

(√11+√7)x(√11-√7)

{Here we have to use the identity (a+b) (a-b) = a^2- b^2}

(√11)^2 - (√7)^2

(√11 x √11) - (√7 x √7)

11-7

4

And we know that 4 is a rational number