Question

if a=√3/√3-√2+√2and b =√3/√3+√2/-√2find the value of a 2b2-5ab​

Answer 1

Answer:

a = (√3-√2)/(√3+√2)

 = (√3-√2)/(√3+√2)× (√3-√2)/(√3-√2) [ rationalizing it]

 =(√3 -√2)²/1 = (√3 -√2)² = 5- 2√6

b= (√3+√2)/(√3-√2)×(√3+√2)/(√3+√2) [ rationalizing it]

 = (√3+√2)²/1 =(√3+√2)² = 5+2√6

now, a²+b² - 5ab 

= (5-2√6)² + (5+2√6)² - 5(5-2√6)(5+2√6)

=25 +24 -20√6 +25 +24 + 20√6 - 5(25-24)

=98 -5 = 93