Question

expand 27ycube fast plzzzzzzz​

Answer 1

(27 y) ³ =(3 y)³

Hope this is useful for you.

Answer 2

(27)³ = (20 + 7)³

(x + y)³ = x³ + 3x²y + 3xy² + y³

= (20)³ + 3(20)²(7) + 3(20)(7)² + (7)³

= (8000) + (3 × 400 × 7) + (3 × 20 × 49) + (343)

= 8000 + 8400 + 2940 + 343

= 19683

Hence

(27)³ = 19683

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