CASE 3:
(x + 5)³ =
(a - b)(a - b)(a - b) =
(x + y)³ =
(x + 4)(x + 4)(x + 4) =
(x + 2y)³ =
(x + 5)³ =
(a - b)(a - b)(a - b) =
(x + y)³ =
(x + 4)(x + 4)(x + 4) =
(x + 2y)³ =
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Answers & Comments
(x+5)³
=x³+3x²×5+3x×5²+5³
=x³+15x²+75x+125
(a-b) (a-b) (a-b)
=(a-b)³
=a³-3a²b+3ab²-b³
(x+y)³
=x³+3x²y+3xy²+y³