answers dont match? (1 Viewer)

[bos1234]

finally got this image thing working thanks ianc

 

[SoulSearcher]

a² + b² + c² = (a+b+c)² - 2(ab + bc + ca)

 

[ianc]

Hi!


You mucked up this line:

It should go like this:

Hope this helps!



edit: sorry SoulSearcher, i didnt see your post

 

[bos1234]

ahhh right of course! :burn:

kk thanks for help got it now

so if its...
(a+b+c+d)^2 = (a+b+c+d)^2 - 2(ab+ac+ad+bc+bd+cd)??

etc?

goodnight

his too quick ^^

 

[ianc]

(a+b+c+d)^2 = (a+b+c+d)^2 - 2(ab+ac+ad+bc+bd+cd)??

Well actually a²+b²+c²+d² = (a+b+c+d)²- 2(ab+ac+ad+bc+bd+cd)


but yeah you got it. but if in an exam you're not sure, always check it - it's only about a minute's worth of algebra to expand some brackets and could save a few marks

Have a good one!

 

[Forbidden.]

n check with your teachers when you come back to school