Question

(2x-1)³ using identity
​

Answer 1

Answer:

We know that,

( a-b) ^3=a^3-b^3-3ab(a-b)

So

=8x^3-1-3(2x-1)

That's your answer

Answer 2

$\huge\mathfrak{Bonjour!!}$

$\huge\bold\purple{ANSWER:}$

⏩ (2x-1)³

Using (a-b)³= a³ -3a²b +3ab² -b³ , expand the expression...

→ (2x)³ -3(2x)² ×1 +3× 2x × (1)² -1³

Evaluate the powers...

→ 8x³ -3× 4x² × 1 + 3× 2x × 1 -1

Calculate the products..

→ 8x³ -12x² + 6x -1

The required solution...

✔✔✔✔✔✔✔

Hope it helps...:-)

✨❤⭐♥✨❤⭐♥✨

Be Brainly..✌✌✌

♠ WALKER ♣