Question

expand (2x-1)³
class 9
polynomial​

Answer 1

Answer:

we know that

..... (a-b)³= a³-3a²b+3ab²-b³

• (2x-3)³
• (2x)³ - 3.(2x)².3 + 3.2x.(3)² - (3)²
• 8x³ - 36x² + 27x - 9

Step-by-step explanation:

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Answer 2

Answer:

Ques=》(2x-1)³

Using the identity (a-b)³=> a³-b³-3ab(a-b)

Solution =》 (2x)³-(1)³-3×2x×1(2x-1)

=> 8x³-1-6x(2x-1)

=> 8x³-1-12x²+6x

=> 8x³-12x²+6x-1

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