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Secondary 1 | Maths
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Date Posted: 4 years ago
Views: 212
a)
7³ - 7 = 336 = (7 - 1) x 7 x (7 + 1)
7³ - 7 = 336 = (7 - 1) x 7 x (7 + 1)
b)
1320 = 10 x 11 x 12
= (11 - 1) x 11 x (11 + 1)
= 11³ - 11
So n is 11
1320 = 10 x 11 x 12
= (11 - 1) x 11 x (11 + 1)
= 11³ - 11
So n is 11
c)
19³ - 19
= (19 - 1) x 19 x (19 + 1)
= 18 x 19 x 20
= 6840
19³ - 19
= (19 - 1) x 19 x (19 + 1)
= 18 x 19 x 20
= 6840
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