Answers
So the first step is to multiple out the brackets. On we have to be very careful we get the signs correct.
31 October 2011
Remember that and
31 October 2011
This means we can think of as
31 October 2011
Expanding the brackets then gives us . I sometimes find that breaking it down into smaller steps can make it easier to avoid a mistake.
31 October 2011
What's the next step?
31 October 2011
Add an answer Cancel reply
Similar questions