Question

Expand(4a^3-7b^3).
plzz help​

Answer 1

✣To expand :- (4a³ - 7b³)²

By using identity :-

◆ (a - b)² = a² + b² - 2ab

So,

→ (4a³)² + (7b³)² - 2 × (4a³) × (7b³)

→ 16a⁵ + 49b⁵ - 56a³b³

Hence, expand.

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More identities:-

• (a+b)² = a² + b² +2ab
• (a+b)(a-b) = a² - b²
• (a + b)³= a³ + b³ +3ab ( a+b)
• (a - b) = a³ - b³ -3ab (a - b)