steps to simplify a problem

**integral** · December 23rd 2009, 02:22 PM

Hello, can someone show me the steps to simplifying:
$\Delta y=(t+\Delta t)^2 - t^2 + 8(t+\Delta t)-8t$
to
$\Delta y=2t(\Delta t)$ $+(\Delta t)^2$ $+8$ $\Delta$ $t$

please, thank you

**pickslides** · December 23rd 2009, 02:44 PM

Hi there integral, all you need to do here is expand the expression and group the like terms.

**integral** · December 23rd 2009, 04:41 PM

$\Delta y=(t+\Delta t)^2 -t^2 +8(t+\Delta t)-8t$
$\Delta y=(t+\Delta t)(t+\Delta t) -t^2 +8(t+\Delta t)-8t$
$\Delta y=t^2+t\Delta t+ (\Delta t(t))+\Delta t^2 -t^2 +8(t+\Delta t)-8t$
$\Delta y=t^2+t\Delta t+ (\Delta t(t))+\Delta t^2 -t^2 +8\Delta t$
$\Delta y=t\Delta t+ t\Delta t+\Delta t^2 +8\Delta t$
$\Delta y=2(t\Delta t)+\Delta t^2 +8\Delta t$

right?

I feel so dumb now. lol

**pickslides** · December 23rd 2009, 04:49 PM

Looks ok, I would do it like this.

$\Delta y=(t+\Delta t)^2 - t^2 + 8(t+\Delta t)-8t$

Grouping

$\Delta y=[(t+\Delta t)^2 - t^2] + [8(t+\Delta t)-8t]$

Using the difference of 2 squares in the first part and expanding the 2nd part we get

$\Delta y=((t+\Delta t) - t)((t+\Delta t)+ t) + [8t+8\Delta t)-8t]$

And simplifying

$\Delta y=\Delta t (2t+\Delta t) + 8\Delta t$

And expanding again

$\Delta y=2t(\Delta t)+(\Delta t)^2 + 8\Delta t$

**integral** · December 23rd 2009, 05:07 PM

That works as well (Thanks for the idea).
Thank you

Thread: steps to simplify a problem

LinkBack

Thread Tools

Display

steps to simplify a problem

Similar Math Help Forum Discussions

steps to simplify equation

Need help on the steps to solving problem

Steps in integration problem

Simplify expression - steps?

Need steps how to solve this little problem!

Search Tags