Question

4xy – x2 - 4y2 + z2​

Answer 1

Answer:

xy - x2 - 4y2 + z2 = z2 - ( x2 + 4y2 - 4xy ) = z2 - ( x - 2y )2 = [ z - ( x - 2y )][ z + ( x - 2y )] [ ∵ a2 - b2 = ( a + b )( a - b )] = [ z - x + 2y ][ z + x - 2y ]. Concept: Method of ...