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secondary 2 | Maths
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huiling
Huiling

secondary 2 chevron_right Maths

help

Date Posted: 7 years ago
Views: 414

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Seow Kok Huei
Seow Kok Huei's answer
13 answers (Tutor Details)
1st
huiling
Huiling
7 years ago
hi thanks so much but can i ask why 4w ecame 8w?
Seow Kok Huei
Seow Kok Huei
7 years ago
which line are you referring to?
Seow Kok Huei
Seow Kok Huei
7 years ago
-4w = 8w-12w (just expressing -4w in a different way)
huiling
Huiling
7 years ago
the second line of y=
Seow Kok Huei
Seow Kok Huei
7 years ago
understand?
huiling
Huiling
7 years ago
sorry but a bit confused
huiling
Huiling
7 years ago
why did you change the numerator when the denominator is still the same?
Seow Kok Huei
Seow Kok Huei
7 years ago
you can choose not to change it. there's always multiple approaches to these questions. I change it to simplify the expression (easier to solve)
huiling
Huiling
7 years ago
oh then may i ask what did you times to change the numerator? is it 2 or 3? because 4w became 8w
Seow Kok Huei
Seow Kok Huei
7 years ago
no no no..... you need to go back to the basics and try and understand the mathematical operation. you cant just add or multiply things (they change the expression, which you are not allowed to do). this is what i did:

1+4w-8w / (1+4w) = (1+4w)/(1+4w) - 8w/(1+4w)
huiling
Huiling
7 years ago
oh i see
Seow Kok Huei
Seow Kok Huei
7 years ago
i should write it this way
(1+4w-8w) / (1+4w) = (1+4w)/(1+4w) - 8w/(1+4w)
huiling
Huiling
7 years ago
i understand it now. thank you
Seow Kok Huei
Seow Kok Huei
7 years ago
you are welcome :)