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Simplify, correct to three significant figures, (27.63)\(^2\) - (12.37)\(^2\) 

Mathematics
WAEC 2019

Simplify, correct to three significant figures, (27.63)\(^2\) - (12.37)\(^2\) 

  • A. 614
  • B. 612
  • C. 611
  • D. 610
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Correct Answer: Option D
Explanation

(27.63)\(^2\) - (12.37)\(^2\) 

= (27.63 + 12.37)(27.63 - 12.37)

= 40 x 15.26

= 610

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