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  • Find 4x * 5y * 7z. First find 4x * 5y and multiply it by 7z; or first find 5y * 7z and multiply it by 4x.

Q :         Find  4x\times 5y\times 7z .

              First find 4x\times 5y and multiply it by 7z;

              or first find 5y \times 7z and multiply it by 4x.

Answers (1)

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\\4x\times 5y\times 7z\\ =(4x\times 5y)\times 7z\\ =20xy\times 7z\\ =140xyz\\ \\4x\times 5y\times 7z\\ =(5y\times 7z)\times 4x\\ =35yz\times 4x\\ =140xyz

We observe that the result is same in both cases and the result does not depend on the order in which multiplication has been carried out.

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