Author Topic: completing sqr using calculator (Read 491 times) Tweet Share

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

the.watchman · « **Reply #1 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

naved_s9994 · « **Reply #2 on:** September 23, 2010, 01:20:36 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.

superflya · « **Reply #3 on:** September 23, 2010, 01:32:50 pm »

^^ no point memorising the y coordinate if u know the x

the.watchman · « **Reply #4 on:** September 23, 2010, 01:34:05 pm »

^^ no point memorising the y coordinate if u know the x

Yep, especially with calc

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