Question

if a-b=6 and ab=5 find a)a^3-b^3 b)a^2+b^2

Answer 1

Step-by-step explanation:

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Praneeth from Brainly.in here to help!

Given

➻ ab=20,

➻ (a-b)=6

➟ (a-b)³=a³-b³-3ab(a-b)

➟ (a-b)³=a³-b³-3a²b+3ab²

➟a ³-b³=(a-b)³+3ab(a-b)

➺ 6³+3*20(6)

➺ 216+360

➺ 576

∴a³-b³=576

hope helped!

Answer 2

Answer:

Your answer is here:-

Step-by-step explanation:

• Given
• ab=20
• (a-b)=6
• (a-b)³=a³-b³-3ab(a-b)
• (a-b)³=a³-b³-3a²b+3ab²
• a ³-b³=(a-b)³+3ab(a-b)
• 6³+3*20(6)
• 216+360
• ∴a³-b³
• =576.

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