Question

Is this correct?
4x − 3y)2

so I multipled here, 4x2 = 16x2 and 3y2= 9y2
so 16x^2+ 9y^2 or do I keep the - sign the same

Answer 1

@Directrix

Answer 2

First rewrite (4x − 3y)^2 as:
\[\Large (4x − 3y)^2 = (4x-3y)(4x-3y) \] Now expand that out: \[\Large (4x-3y)(4x-3y)\]

Answer 3

ohh i see, and i multiple now? @agent0smith

Answer 4

Yes, use http://www.algebrahelp.com/lessons/simplifying/foilmethod/pg2.htm if you need help.

Answer 5

so it would be 16x2 +9y2 ;o? i cant tell whether to use + or - but i know my steps! @agent0smith

Answer 6

No, you're missing something. Follow the steps more closely on this page: http://www.algebrahelp.com/lessons/simplifying/foilmethod/pg2.htm

And remember that a negative times a negative is a positive, and a positive times a negative is negative.

-*- = +

+*- = -

Answer 7

You have the first and last terms correct, but you're missing the middle term.