Question

(1) If a - b = 7, ab = 30, find a3 -a3​

Answer 1

I think your question should be a3-b3 instead of a3-a3

please check it here is my answr with a3-b3

Answer 2

The value of " a³-b³" will be "973". Further explanation is given below.

Step-by-step explanation:

Given:

(a-b)= 7

ab= 30

As we know,

(a-b)³= a³-b³-3ab (a-b)

On putting the values of (a-b) and ab in the above equation, we get

⇒ (7)³= a³-b³-3×30×7

⇒ 7×7×7= a³-b³-630

⇒ 343=  a³-b³-630

⇒ a³-b³= 343+630

⇒ a³-b³= 973

Learn more:

find a and b​...

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