Question

49 a square minus b square is equal to( 7A + 1/2)( 7A - 1 / 2)​

Answer 1

Answer:

As you know

(a+b)(a-b)=a^2-b^2

49a^2-b^2=(7a+1/2)(7a-1/2)

49a^2-b^2=49a^2-1/4

b^2=1/4

b=1/2