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December 21, 2014

December 21, 2014

Posted by **Tommy** on Monday, June 20, 2011 at 4:56pm.

y=x^2-x-23

- Algebra -
**bobpursley**, Monday, June 20, 2011 at 5:39pm0=2x-1

x=1/2, y=1/4-1/2-23=-23.75

That is with Calculus. Now in Algebra, do this

y=x^2-x + xxxx -23-xxxxx

we are going to make a difference of prefect squares.

y=x^2-x+1/4 -23-1/4

y= (x-1/2)^2 - (sqrt22.75)^2

so clearly, this is a minumum at x=1/2

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