Question Details

If the sum of two numbers x and y is 12 and their product is 27, then find the sum of their cubes.

Options

A

576

B

657

C

756

D

765

Show Answer

Correct Answer :

Option C

756

Solution :

The correct answer is 756.

Given:
Sum of two numbers: x+y=12
Product of two numbers: xy=27

We need to find the value of the sum of their cubes, which is x3+y3.

Step-by-step Solution:

We use the algebraic identity for the sum of cubes:

x3+y3=(x+y)33xy(x+y)

Substitute the given values into the algebraic identity:

x3+y3=(12)33×27×12

Calculate each part separately:

(12)3=1728

3×27×12=81×12=972

Now, subtract 972 from 1728:

x3+y3=1728972=756

Therefore, the sum of their cubes is 756.

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