Question

find the value of rod a-b if 8+3 root 7/8-3 root 7- 8-3 root 7/8+3 root7=a-broot7

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