Question

if 8+3 root 7/8-3 root 7=a+b root 7, find a & b​

Answer 1

Answer:

254

Step-by-step explanation:

a = 8+3√7   b = 1/a  ⇒ 1/8+3√7

                                ⇒ 8-3√7/1  ( on rationalising )

  a = 8+3√7    b = 8-3√7

  a²+b² = (8+3√7)² + (8-3√7)²

            =  (64 + 63+48√7) + (64 + 63 - 48√7)

  a²+b² =   254

Answer 2

Answer:

(a+b)(a-b) = a² + b²

Step-by-step explanation:

=> 8²- (3√7)²

=> 64 - 9(7)

=> 64-63

= 1