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# C3 solomon paper B help please!! watch

1. So confused

Find, in terms of π, the solutions of the equation sin 5x + sin x = 0, for x in the interval 0 ≤ x < π.

I didn't know how to do it, but the mark scheme gave this as the identity you need to turn the equation into?

2 sin 3x cos 2x = 0

How do you form this equation what identity is it using?

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf
2. (Original post by eyeman567)
So confused

Find, in terms of π, the solutions of the equation sin 5x + sin x = 0, for x in the interval 0 ≤ x < π.

I didn't know how to do it, but the mark scheme gave this as the identity you need to turn the equation into?

2 sin 3x cos 2x = 0

How do you form this equation what identity is it using?

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf
You need to realise there is a link between Q3(a) and Q3(b).

From question 3(a), if you set and you get:

.
3. (Original post by Zacken)
You need to realise there is a link between Q3(a) and Q3(b).

From question 3(a), if you set and you get:

.
Thanks a lot haha, missed that completely.

could you help me with 4a?

y = x^5/2 ln x/4

when Y = 0 find the coordinate, only one mark but unsure what I need to do
4. (Original post by eyeman567)
Thanks a lot haha, missed that completely.

could you help me with 4a?

y = x^5/2 ln 4x

when Y = 0 find the coordinate, only one mark but unsure what I need to do
A curve crosses the x-axis when , so in this case: this means either or , but the first one gives but the question says so it's not a valid solution.

So you need to solve . What does that give you?

Hint:

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