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Maths questions help

rdrf.pnghi, could someone help with questio 2c 3. i have factorised and got the two x values but cannot seem to draw it
for line of symetry i got -4
for vertex (-4,25)
factorising x=9 and x=-1
Reply 1
Avatar for Notnek
Notnek
21
Original post by Bence9912
rdrf.pnghi, could someone help with questio 2c 3. i have factorised and got the two x values but cannot seem to draw it
for line of symetry i got -4
for vertex (-4,25)
factorising x=9 and x=-1

You only seem to be missing the point where it intersects the y-axis.

Do you have any ideas for this?

And why specifically are you unable to draw it?
Reply 2
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Bence9912
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9
Original post by notnek
You only seem to be missing the point where it intersects the y-axis.

Do you have any ideas for this?

And why specifically are you unable to draw it?


point where it intersects y is at 9
i know how to draw these but this one does not seem to work out.
Reply 3
Avatar for Notnek
Notnek
21
Original post by Bence9912
point where it intersects y is at 9
i know how to draw these but this one does not seem to work out.

Can you explain what you mean? You seem to have all the information.

Do you what the general shape will be?

Plot all of the points you know and then draw a curve that goes through all of them.
Reply 4
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Bence9912
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9
Original post by notnek
Can you explain what you mean? You seem to have all the information.

Do you what the general shape will be?

Plot all of the points you know and then draw a curve that goes through all of them.


heres a little sketch i just did hopefully u can read my handwriting
IMG_5017[1].jpg
from the equation, we know it's a sad face (the x^2 is negative)
we know the intersections at the axes are (-9,0) (1,0) and (0,9)
and the maximum point also the line of symmetry is (-4,25)

U can sketch this curve easily now just plot all these points and join them.
(edited 8 years ago)
Original post by Bence9912
heres a little sketch i just did hopefully u can read my handwriting
IMG_5017[1].jpg


Ur X-Intercepts are wrong. they are the opposite sign
Reply 7
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Bence9912
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9
Original post by iylianuraiman
Ur X-Intercepts are wrong. they are the opposite sign


what so (4,-25)
Reply 8
Avatar for Notnek
Notnek
21
Original post by Bence9912
rdrf.pnghi, could someone help with questio 2c 3. i have factorised and got the two x values but cannot seem to draw it
for line of symetry i got -4
for vertex (-4,25)
factorising x=9 and x=-1

I just noticed that your x values are wrong. Have another go and post your working if you get the same thing.
Reply 9
Avatar for Bence9912
Bence9912
OP
9
Original post by iylianuraiman
from the equation, we know it's a sad face (the x^2 is negative)
we know the intersections at the axes are (-9,0) (1,0) and (0,9)
and the maximum point also the line of symmetry is (-4,25)

U can sketch this curve easily now just plot all these points and join them.


ive been tought that you swap the sign in the bracket
Original post by Bence9912
what so (4,-25)


i said x intercept not ur maximum point. the line of symmetry is correct
Reply 11
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Bence9912
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9
Original post by Bence9912
ive been tought that you swap the sign in the bracket


never mind noticed my mistake

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