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# c1 solomon paper c watch

1. Just doing some revision - not sure what it means exactly with question 8 from paper c - c1 solomon papers.

Figure one shows the graph of y = f(x)

Write down the number of solutions that exist for the equation

f(x) = 1

f(x) = - x

Answer in the mark scheme say 3 and 1 respectively but just not sure what the questions means....

Must be something simply because its only worth two marks. ..
2. (Original post by christinajane)
Just doing some revision - not sure what it means exactly with question 8 from paper c - c1 solomon papers.

Figure one shows the graph of y = f(x)

Write down the number of solutions that exist for the equation

f(x) = 1

f(x) = - x

Answer in the mark scheme say 3 and 1 respectively but just not sure what the questions means....

Must be something simply because its only worth two marks. ..
You dont understand it, f(x)=1, whats f(x) and when it equals 1, how many solutions or points are there , and same for the next one, figure it out

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3. Its a bit of a funny graph - doesn't give you f(x)

It touches the x axis at -2 and 2 - so I thought f(x) = (x-2)(x+2) or (x-4)^2

But the graph isn't a curve so its kinda throwing me little - hmmm
4. (Original post by christinajane)
Its a bit of a funny graph - doesn't give you f(x)

It touches the x axis at -2 and 2 - so I thought f(x) = (x-2)(x+2) or (x-4)^2

But the graph isn't a curve so its kinda throwing me little - hmmm
f(x) is the same as writing 'y', so all you do is draw the line f(x) = 1, otherwise known as y=1 on the graph they give you, then see how many times the line y=1 crosses the line drawn on the graph. This is the number of solutions you are looking for.

Do the same for f(x) = -x
5. Ahhh yes!

I thought I had to figure out f(x) by looking at the graph, because it doesn't give you f(x) - expand brackets etc equate it to one and find the solutions that way... over complicating matters
6. (Original post by christinajane)
Ahhh yes!

I thought I had to figure out f(x) by looking at the graph, because it doesn't give you f(x) - expand brackets etc equate it to one and find the solutions that way... over complicating matters
That would work if they gave you an equation. This question is simpler too
7. is the equation of this graph not (X-2)(X-2)(X+2)?
8. you just need to sketch y = 1 and y = -x and see how many intersects do they have with original curve

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Updated: March 6, 2018
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