Question

Find the value of a3 – b3,if
a-b = 5/7 and ab=7/3​

Answer 1

Step-by-step explanation:

a - b = 5/7

ab = 7/3

Then,

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

On rearranging,

$a {}^{3} - b {}^{3} = (a - b) {}^{3} + 3ab(a - b)$

Substituting,

= (5/7)^3 + 3×7/3 (5/7)

=125/343 + 7 × 5/7

= 125/343 + 5

=1840/343 = 15.36

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Hope it helps.....!

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Answer 2

Answer:

1840/343

Step-by-step explanation:

I hope this is the correct answer...