Question
Find the value of using the column method:
$(23)^2$
$(23)^2$
✓
Answer
Given number $23=20+3$
Here,
$a =20$ and $b =3$
$\therefore(23)^2=(400+120+9)=529$
Here,
$a =20$ and $b =3$
| $a ^2$ |
$2ab$
|
$b_2$
|
| $(20)^2=400$ |
$2 × 20 × 3 = 120$
|
$(3)^2=9$
|
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