Question

Detail solutions of q47 and q49

Answer 1

     If 6x - x²  - 1 = 0 use quadratic formula

x = 3 ± 2√2

we can't do square root if  minus number comes

So x = 3 + 2√2 = 1² + (√2)² + 2√2 = (1+ √2)²

√x = √(1+√2)² = 1 + √2

1/√x =       1          =     (1 - √2)        =   1  -  √2  = -1 + √2

             1+ √2               (1)² - (√2)²             1-2        

√x - 1/√x  = 1 + √2 + 1 - √2 =  2