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= 81.9⁷ + 9⁷
= 9⁷.(81+1)
= 9⁷.(82)
f. (-23)²⁰ - (-23)¹³ = (-23)⁷.(-23)¹³ - (-23)¹³
= (-23)¹³.((-23)⁷ - 1)
g. 15⁷ - 15¹¹ = 15⁶.15¹¹ - 15¹¹
= 15¹¹.(15⁶ - 1)
h. (-a)²⁸ - (-a)¹⁸ = a¹⁰.a¹⁸ - a¹⁸
= a¹⁸.(a¹⁰ - 1)