Instructions

What value should come in the place of question mark (?) in the following questions?

Question 130

$$(63)^{2} - (12)^{2}= ?$$

Solution

Expression : $$(63)^{2} - (12)^{2}= ?$$

= $$(63 - 12) (63 + 12)$$

= $$51 \times 75 = 3825$$

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