Find the square of 42 without multiplication
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Answer:
refer to the above attachment
hope it helps you...
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Step-by-step explanation:
Consider the given number.
42
We know that (a+b)²=a²+b²+2ab
Therefore, (40+2)²=(40)²+2²+2×40×2
(42)²=1600+4+160
(42)²=1764
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