Question

find the square of 42 by coloum method

Answer 1

Answer:

(a+b)^2=a^2+2ab+b^2

=(42=40+2)

=(40+2)^2=(40)^2+2(40)(2)+(2)^2

=1600+160+4

=(42)^2=1764

Step-by-step explanation:

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Answer 2

Answer:

Solution:

We know that

$$\begin{lgathered}( {a + b)}^{2} = {a}^{2} + 2ab + {b}^{2} \\ \\ here \\ 42 = 40 + 2 \\ \\ {(40 + 2)}^{2} = ( {40)}^{2} + 2(40)(2) + {2}^{2} \\ \\ = 1600 + 160 + 4 \\ \\ ( {40)}^{2} = 1764 \\ \\\end{lgathered}$$

put those values in the column,while writing the answer

Hope it helps you.