Question

expand the identities (x+5y)³​

Answer 1

Answer:

(x+y)³ = (x)³ + (5y)³ + 3 × x × 5y (x+5y)

= x³ + 125y³ + 15xy (x+5y)

= x³ + 125y³ + 15x²y + 75xy²

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Answer 2

Answer:

(x+5y)³

(a+b)³= a³+b³+3a²b+3ab²

=(x)³+(5y)³+[3×(x)²×(5y)]+[3×x×(5y)²]

= x³+125y³+15x²y+15xy²