find the cube of 396 by identities
Answers
Answered by
3
(369) ^3 = (400-4) ^3
Identity using (a-b) ^3
= a^3 - b^3 - 3(a)^2(b) + 3(a)(b)^2
a=400 : b=4
(400)^3 - (4)^3 - 3(400)^2 (4) + 3(400)(4)^2
64000000 - 64 - 1920000 + 19200
= 62099136
Identity using (a-b) ^3
= a^3 - b^3 - 3(a)^2(b) + 3(a)(b)^2
a=400 : b=4
(400)^3 - (4)^3 - 3(400)^2 (4) + 3(400)(4)^2
64000000 - 64 - 1920000 + 19200
= 62099136
Similar questions