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. ..
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christinajane
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- 08-05-2016 12:27
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- 08-05-2016 12:29
(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. ..
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christinajane
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- 08-05-2016 12:34
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 -
Ishan_2000
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- 08-05-2016 12:40
(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
Do the same for f(x) = -x -
christinajane
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- 08-05-2016 12:47
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 mattersLast edited by christinajane; 08-05-2016 at 12:50. -
Ishan_2000
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- 08-05-2016 15:25
(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 -
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- 16-05-2016 15:27
is the equation of this graph not (X-2)(X-2)(X+2)?
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Mohammadreza490
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- 06-03-2018 00:28
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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