Important Formulas
IMPORTANT MATHS FORMULAE Algebra: (a + b) 2 = a 2 + 2ab + b 2 (a – b) 2 = a 2 – 2ab + b 2 (a + b) (a – b) = a 2 – b 2 (x + a)(x + b) = x 2 + (a + b)x + ab (x + a)(x – b) = x 2 + (a – b)x – ab (x – a)(x + b) = x 2 + (b – a)x – ab (x – a)(x – b) = x 2 – (a + b)x + ab (a + b) 3 = a 3 + b 3 + 3ab(a + b) (a – b) 3 = a 3 – b 3 – 3ab(a – b) (x + y + z) 2 = x 2 + y 2 + z 2 + 2xy + 2yz + 2xz (x + y – z) 2 = x 2 + y 2 + z 2 + 2xy – 2yz – 2xz (x – y + z) 2 = x 2 + y 2 + z 2 – 2xy – 2yz + 2xz (x – y – z) 2 = x 2 + y 2 + z 2 – 2xy + 2yz – 2xz x 3 + y 3 + z 3 – 3xyz = (x + y + z)(x 2 + y 2 + z 2 – xy – yz -xz) x 2 + y 2 = 1212 [(x + y) 2 + (x – y) 2 ] (x + a) (x + b) (x + c) = x 3...