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# Hard Indices question watch

1. Im going through exercises in the A level MEI maths Year 1 book and Im stuck on this particular question in the topic "Working with indices".
(1+x)^1/2 + (1+x)^3/2 simplify.

I got to the second step where you use the exponent rule a^b+c = (a)^b(a)^c
to simplify the whole expression into:
(1+x)^1/2 + (1+x)(1+x)^1/2
I googled this and the next step is to "factor out the common term (1+x)^1/2 to arrive to an answer of (x+2)(x+1)^1/2 and I have no idea how they got to this answer, would appreciate if someone explained the jump and what it means
2. (Original post by Mermaidqueen)
Im going through exercises in the A level MEI maths Year 1 book and Im stuck on this particular question in the topic "Working with indices".
(1+x)^1/2 + (1+x)^3/2 simplify.

I got to the second step where you use the exponent rule a^b+c = (a)^b(a)^c
to simplify the whole expression into:
(1+x)^1/2 + (1+x)(1+x)^1/2
I googled this and the next step is to "factor out the common term (1+x)^1/2 to arrive to an answer of (x+2)(x+1)^1/2 and I have no idea how they got to this answer, would appreciate if someone explained the jump and what it means
next step:
-You are taking out a factor of (1+x)^1/2 (if you dont understand this, multipy the square bracket by the (1+x) and you will understand).

you add up what is in the square bracket
3. (Original post by Dexter212)
next step:
-You are taking out a factor of (1+x)^1/2 (if you dont understand this, multipy the square bracket by the (1+x) and you will understand).

you add up what is in the square bracket
:/ I still don't understand what you mean by taking out a factor of (1+x)^1/2
4. (Original post by Mermaidqueen)
:/ I still don't understand what you mean by taking out a factor of (1+x)^1/2
When you have
- you can take out a factor of
That will leave you with : you are just removing(dividing) the whole equation by 5x
This is the same thing that they are doing with your Equation.

if you expand this you get your original equation of

just factor out (1+x)^1/2
simplify the square bracket

i hope someone else replies and helps you, if you still dont understand.
5. Put U = (1 + x) ^ 1/2. Then the equation becomes U + U ^3. Factorise then replace the U.
6. (Original post by Dexter212)
When you have
- you can take out a factor of
That will leave you with : you are just removing(dividing) the whole equation by 5x
This is the same thing that they are doing with your Equation.

if you expand this you get your original equation of

just factor out (1+x)^1/2
simplify the square bracket

i hope someone else replies and helps you, if you still dont understand.
Omg!!! Yes, I understand it now, thank you so much honestly I was stuck on this for like 2 days! I think the thing that was confusing me was the fact that the (x+1) was to the power of 1/2 and it just confused everything but i get it now

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