Brilliant Academy of Learning

   Important Maths Formulae for General competitions & Entrance Exams 1. (a+b)2=a2+2ab+b2 [a plus b whole square is equal to a square plus two a b  plus b square] 2.(a+b)2=(a-b)2+4ab [a plus b whole square is equal to a minus b whole square plus four a b ] 3.(a-b)2=a2-2ab+b2 [a minus b whole square is equal to a square minus two a b plus b square] 4.(a-b)2=(a+b)2-4ab [a minus b whole square is equal to a plus b whole square minus four a b] 5. a2-b2=(a+b)(a-b) [a square minus b square is equal to a plus b multiplied by a minus b] 6. (a+b)2+(a-b)2=2(a2+b2) [a plus b whole square plus a minus b whole square is equal to two multiplied in sum of a square and b square] 7. (a+b)2- (a-b)2=4ab [a plus b whole square minus a minus b whole square is equal to four a b ] 8.(a+b+c)2=a2+b2+c2+2ab+2bc+2ca [a plus b plus c whole square is equal to a square plus b square plus c square plus two a b plus two b c plus two c a ] 9.(a+b)3=a3+b3+3ab(a+b) [a plus b whole cube is equal to a cu...