Expand : ( 2a – 3b )² 4a² + 12ab + 9b² 4a² – 12ab + 9b² 4a² – 12ab – 9b² Please answer urgently About the author Mary
Answer:
(2a – 3b)²
= (2a)² + (3b)² – 2 × 2a × 3b
= 4a² – 12ab + 9b²