Diagram shows the curve of a quadratic function , where , and are constant.

a)find the value of , and

b)Determine the range value of if

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- October 14th 2010, 04:03 AMmastermin346quadratic function problem
Diagram shows the curve of a quadratic function , where , and are constant.

a)find the value of , and

b)Determine the range value of if - October 14th 2010, 04:12 AMmr fantastic
- October 14th 2010, 04:15 AMgreatersanta616
The point at which the curve crosses the 'y' axis is the value of c. This being -2.

by using the complete the square form, we can work out the rest of the equation.

To do this, we use the vertex, or lowest point of the graph.

y=(x+1)^2-3

this gives us x^2+2x+1-3 or x^2+2x-2

Thus. The values are ....

I cannot recall an answer to part b. But I hope this has helped :) - October 14th 2010, 04:52 AMmastermin346
hi!

check my answer:

minimum value =

the value of is

at point

is correct sir? - October 14th 2010, 07:07 PMEducated
Seems correct to me.

You can always double check by putting in x=-1 and seeing if the y co-ordinate is correct. - October 14th 2010, 07:57 PMmastermin346
how about the range?

- October 14th 2010, 08:05 PMEducated

Can you carry on? - October 14th 2010, 08:18 PMmastermin346
so,the range is and ?

- October 14th 2010, 08:20 PMEducated
Yep.