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Secondary 1 | Maths
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Elly
Elly

Secondary 1 chevron_right Maths chevron_right Singapore

Elp

Date Posted: 4 years ago
Views: 206
snell
Snell
4 years ago
* hint: to get perfect cube, the indices r multiples of 3

given; 396 = 2² x 3² x 11
we see '2' has index 2. so it is short of one '2'

we see '3' has index 2. so it is short of one '3'

we see '11' has index 1. so it is short of two '11's

∴ k = 2 x 3 x 11² = 726
snell
Snell
4 years ago
(b)
2100h = 2² x 3 x 5² x 7 x h

compare with 396 = 2² x 3² x 11

2100 is short of a factor of 11
& a factor 3

so to make 2100h a multiple of 396,
h = 3x11 = 33

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Karishma Rs
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Merlion
Merlion
4 years ago
Why 3x 11?