Question
Find the cubes of the following number by column method: $72$
✓
Answer
Thus, cube of $56$ is $175616$. We have to find the cube of $72$ using column method.
We have: $a = 7$ and $b = 2$
We have: $a = 7$ and $b = 2$
|
Column $I$
|
Column $II$
|
Column $III$
|
Column $IV$
|
| $a^3$ | $3 \times a^2 \times b$ | $3 \times a \times b^2$ | $B^3$ |
| $7^3=343$ | $3 \times a^2 \times b=3 \times 7^2 \times 2=294$ | $3 \times a \times b^2=3 \times 7 \times 2^2=84$ | $2^3=8$ |
|
$+30$
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$+8$
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$+0$
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$8$
|
|
$373$
|
$302$
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$84$
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|
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$373$
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$2$
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$4$
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$8$
|
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