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January 29, 2015

January 29, 2015

Posted by **Megan** on Tuesday, September 17, 2013 at 9:27pm.

- elementary functions -
**Reiny**, Tuesday, September 17, 2013 at 9:34pmf(x+h) = (x+h)^2 + x+h - 3

= x^2 + 2xh + h^2 + x + h - 3

then ( f(x+h) - f(x) )/h

= (x^2 + 2xh + h^2 + x +h - 3 - x^2 - x + 3)/h

= ( 2xh + h^2 +h)/h

= h(2x + h + 1)/h

= 2x + h + 1 , h ≠0

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