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[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !

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SkyPilotage:

--- Quote from: $H00t!N& $t@r on May 08, 2011, 01:19:19 pm ---question

Q10 (ii) and (iii) m/j 2009
 


--- End quote ---
II)
the axis of symmetry is at x=3 so the distance from both sides of the axis must be equal so A=6
III)
to find the range in the domain given, the minimum point is at the vertex(x=3) and y=-5
the largest y is when x=0 or x=6---->y=13
----->the range is -5<y<13

$H00t!N& $t@r:

--- Quote from: SkyPilotage on May 08, 2011, 01:37:20 pm ---II)
the axis of symmetry is at x=3 so the distance from both sides of the axis must be equal so A=6
III)
to find the range in the domain given, the minimum point is at the vertex(x=3) and y=-5
the largest y is when x=0 or x=6---->y=13
----->the range is -5<y<13

--- End quote ---

oh! thanks :) 
for the question about range... i got a bit confused because i was told that whenever you have a(x + b)^2 + c ... c is always the range. I didn't consider the part where they said "When A has this value..."
So what if they only said find the range of f. Would it just be x>= -5 ?

........:
If you have a given domain and a equation just substitute x values into the equation to get the range.

Correct me if i am wrong.

elemis:

--- Quote from: ........ on May 08, 2011, 03:07:45 pm ---If you have a given domain and a equation just substitute x values into the equation to get the range.

Correct me if i am wrong.

--- End quote ---

True.

$H00t!N& $t@r:
yeah I know that...
 I just wanted to know if the statement "whenever you have a(x + b)^2 + c ... c is always the range" is right or not...

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