Question

Expand (5/3x-1)3 using suitable identit​

Answer 1

Answer:

☞ (5/3x–1)³ = ??

Step 1:

Finding the Identity:

(x–y)³ = x³–y³+3xy²–3x²y.

Step 2:

Substituting values in the identity:

☞ x = 5/3x

☞ y = 1

☞ (5/3x–1)³ = (5/3x)³–(1)³+3(5/3x)(1)²–3(5/3x)²(1)

☞ (5/3x–1)³ = 125/27x³–1+5/x–25/3x²

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