Q) Find the value of a & b if √11 - √7/√11 + √7 = a - √77 b
( / is divide, √ is root. )
Q) If a = √3 - √2 / √3 + √2 & b = √3 + √2 / √3 - √2
Find the value of a2 + b2 - 5ab.
Answers
Answered by
4
A) = ( √11-√77)²/4
by rationalising denominator
11-2√77+7/4
by using identity(a+b)²=a²+b²+2ab
18-2√77/4
adding. 11 and 7
2(9-√77)/4
taking 2 as common
9-√77/2=a-√77b
a=9
b=1/2
by rationalising denominator
11-2√77+7/4
by using identity(a+b)²=a²+b²+2ab
18-2√77/4
adding. 11 and 7
2(9-√77)/4
taking 2 as common
9-√77/2=a-√77b
a=9
b=1/2
Similar questions