im having trouble working out c in this formula

The method of completing the square can be used to write the expression:

5x^2+20x-12 in the form a(x+b)^2+c where a, b and c are constants. What is the value of c?

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- Sep 22nd 2008, 07:36 AMoffahengaway and chipscompleting the square
im having trouble working out c in this formula

The method of completing the square can be used to write the expression:

5x^2+20x-12 in the form a(x+b)^2+c where a, b and c are constants. What is the value of c? - Sep 22nd 2008, 08:21 AMkalagota
- Sep 22nd 2008, 08:26 AMoffahengaway and chips
Still a bit confused here, is r=c?

- Sep 22nd 2008, 08:39 AMShyam
- Sep 22nd 2008, 08:47 AMoffahengaway and chips
Just to double check is c= -32?

- Sep 22nd 2008, 09:33 AMShyam
yes, it is -32.

- Sep 22nd 2008, 09:58 AMbkarpuz
In general, for with , we have

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