(82)2 – (18)2 = ? A. 8218 B. 6418 C. 6400 D. 7204

1.	(82)2 – (18)2 = ? A. 8218 B. 6418 C. 6400 D. 7204
Answer» (82)² – (18)² By using (a – b)(a + b) = a² – b² = (82 – 18)(82 + 18) = (64)(100) = 6400

Answer»

(82)² – (18)²

By using (a – b)(a + b)

= a² – b² = (82 – 18)(82 + 18)

= (64)(100)

= 6400

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