Question

please help me in this question seniors

Answer 1

Hy friend, here's ur ans...
49x²-b = (7x+1/2)(7x-1/2)
(here, (a+b)(a-b) = a²-b²)
49x²-b = (7x)²-(1/2)²
49x²-b = 49x²-(1/4)
49x²-49x²-b = -1/4
-b = -1/4


$b \: = \: \frac{1}{4}$

: )

Hope it helped u...