Question

Expand the following (b-4c)(b+4c)

Answer 1

(b^2-16c^2)
Hope it helps you

Answer 2

Hey there,

Algebraic Identity :
  → ( a + b )( a - b ) = ( a² - b² )

=> ( b + 4c )( b - 4c )

= ( b² - (4c)² )

= ( b² - 16c² )

Hope this helps .. :)