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secondary 2 | Maths
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Change the subject
Date Posted: 4 years ago
Views: 306
Which question?
Question 95 to 98
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Could you please explain?
- You need to know the special products. Here, I’m using (a^2 - b^2) = (a+b)(a-b).
- By factorising the Right Hand Side (RHS) as much as possible, I can cancel out common factors from the numerator and denominator.
- Once simplified, I can make x the subject far more easily.
- By factorising the Right Hand Side (RHS) as much as possible, I can cancel out common factors from the numerator and denominator.
- Once simplified, I can make x the subject far more easily.
In case you don’t know the special products,
1. (a^2 - b^2) = (a+b)(a-b)
2. (a+b)^2 = a^2 + 2ab + b^2
3. (a-b)^2 = a^2 - 2ab + b^2
Very sure your school has covered this by now and you have it in your notes.
1. (a^2 - b^2) = (a+b)(a-b)
2. (a+b)^2 = a^2 + 2ab + b^2
3. (a-b)^2 = a^2 - 2ab + b^2
Very sure your school has covered this by now and you have it in your notes.
Yes. Thanks very much. I understand now
Another question, is the same concept to be applied for all other types of changing the subject questions?
No, it depends on how difficult the question is. There is a whole range of possibilities when making something the subject: factorisation, cross multiplication, using squares and square roots (cube, cube roots, etc) for example.
Oh. Thanks a lot
forgot about b) but that’s just simple substitution.
When you bring the numerator of a fraction to the other side does it multiply or divide?
And can the final answer be y=a(a+b)/2a+b ?
for part a), yes.
Thanks
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