Question

Is the number (3-√11) (3+√11) a rational or an irrational

Answer 1

Answer:

Step-by-step explanation:

( 3 - sqrt(11) )( 3 + sqrt(11) ) = 9 - 11 = - 2.

so the given number is rational

Answer 2

= ( 3 - root 11 ) ( 3 + root 11 )

here it is in the form of ( a - b ) ( a + b ) = a sq - b sq

= 3 sq - root 11 sq

= 9 - 11 = - 2

therefore , it is a rational number.