Question

answer plzzzzzz . mark as you brainliest​

Answer 1

10) 4/√5-1

=4/√5-1* √5+1 /√5+1

=4√5+4 / 5-1

=4√5+4 / 4

=4√5/4 +4/4

=√5

11) (√11-√7)(√11-√7)

=(√11)^2 - (√7)^2

=11 - 7

=4

....plzzz mark the answer as brainliest

Answer 2

Answer:

1. 1/√2 = √2 /( √2 × √2 ) = √2 /2 = 1.414/2 = 0.707

2.

4/ (√5-1)

4/ (√5-1) = 4 (√5+1) / (√5+1) (√5-1)

4/ (√5-1) = 4 (√5+1) / (√5+1) (√5-1)= 4 (√5+1) / ( 5-1)

4/ (√5-1) = 4 (√5+1) / (√5+1) (√5-1)= 4 (√5+1) / ( 5-1)= 4 (√5+1) / 4

4/ (√5-1) = 4 (√5+1) / (√5+1) (√5-1)= 4 (√5+1) / ( 5-1)= 4 (√5+1) / 4= (√5+1)

3. ( √11 - √7) ( √11 + √7)

= ( √11) ^2 - ( √7) ^2

= 11 - 7

= 4