ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: qshyrn on September 23, 2010, 12:38:42 pm

Title: completing sqr using calculator
Post by: qshyrn on September 23, 2010, 12:38:42 pm: can the calculator get a quadratic into tp form? i k now its easy to do by hand, but for the sake of convenience
Title: Re: completing sqr using calculator
Post by: the.watchman on September 23, 2010, 01:00:20 pm: The x-coordinate of the TP of a quadratic $y=ax^2+bx+c$ is $\frac{-b}{2a}$
Sub that in on calc to get y-coordinate :)
Title: Re: completing sqr using calculator
Post by: naved_s9994 on September 23, 2010, 01:20:36 pm: Quote from: the.watchman on September 23, 2010, 01:00:20 pm
The x-coordinate of the TP of a quadratic $y=ax^2+bx+c$ is $\frac{-b}{2a}$
Sub that in on calc to get y-coordinate :)

ACTUALLY...

c - (B^2)
________ = y-coordinate :)
4a

Or something very close too that.
Title: Re: completing sqr using calculator
Post by: superflya on September 23, 2010, 01:32:50 pm: ^^ no point memorising the y coordinate if u know the x :P
Title: Re: completing sqr using calculator
Post by: the.watchman on September 23, 2010, 01:34:05 pm: Quote from: superflya on September 23, 2010, 01:32:50 pm
^^ no point memorising the y coordinate if u know the x :P

Yep, especially with calc :)