Question

pls answer 88 and 89 its urget

Answer 1

88=b,89=a are the answers

Answer 2

88. 3 - 3 (3) +5 (2)
= 3- 9+10
= - 6+10
=4
So, option b is correct

89.(√3 +√2)/(√3-√2) = a+b√6

first you need to rationalize it's denominator

= (√3 +√2)(√3 +√2)÷(√3 -√2)(√3 +√2)
= (3 +2 + 2√6) / (3-2) [as (a+b)(a-b) =a^2 -b^2]
= (3 +2 + 2√6)

So, here we got
(3 +2 + 2√6) = a+b√6
5 +2√6 = a+b√6

a= 5 and b =2
and here option a is correct one.