Recent content by Eleeist

Homework Statement I have done an experiment in which I measured the specific heat capacity of a coin. I would like to compare the results to the actual value. I have found out that the coin is made of Cupronickel alloy (for simplicity let's assume it's just 75% copper and 25% nickel)...

No. I actually realized that just now :). I thought you meant "c" as y-intercept. But now that you explained that it is rather "a", then I understand the logic. Thanks for detailed explanation.

I understand that part. But how did the c get before brackets?

Yes, I know the factor theorem. But I cannot understand how you can deduce y=c(x-2)(x+2). Do you suggest that c is coefficient of x^2 (of course it is to)?

Sorry, I meant b and a and was referring to the equation in form ax^2+bx+c=y. How would I go about using this form to solve the problem? Also, could you please explain in more detail this: y=c(x−2)(x+2) I think I am seeing this form for the first time, but I might be wrong.

But then I don't have b and a.

And what if the point which the function crosses is not y-intercept, eg (4,18)?

Ok, got it: -2x^2+8=y Thanks.

It means that they cross the x axis. And where they cross y=0... But then I get this: a(2)^2+2b+8=0 I still have two unknowns.

Well, I know c = 8, but I still don't know the values of a and b. ax^2+bx+8=y.

Homework Statement Find the quadratic function which has x-intercepts -2 and 2 and passes through the point (0,8). I am struggling with solving this one. I tried to substitute values into ax^2+bx+c=y but there are too many unknowns. Can anyone give some tips how to solve it?