The square of 42 is: - Vidyadip

MCQ

The square of $42$ is:

A
$1664$
✓
$1764$
C
$1504$
D
$1564$

✓

Answer

Correct option: B.

$1764$

$42^2 = (40 + 2)^2$
$= (40 + 2)(40 + 2)$
$= 40(40 + 2) + 2(40 + 2)$
$= 40^2 + 40 × 2 + 2 × 40 + 2^2$
$= 1600 + 80 + 80 + 4$
$= 1764$

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