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Question

Answer

(a)

5² – 4² = (5 + 4)(5 – 4) = 9

6² – 5² = (6 + 5)(6 – 5) = 11

 

(b)

n² – (n – 1)² = (n + (n -1))(n – (n – 1) = 2n – 1

 

(c)

2n – 1 = 623

2n = 624

n = 312

a = 312, b = 311

 

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