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January 25, 2015

Posted by **Nipunika** on Wednesday, December 12, 2012 at 7:15am.

solve with steps

- Mathmatics -
**MathMate**, Wednesday, December 12, 2012 at 10:02amFirst simplify given expression

2a+6b-3(a+3b).... first remove parentheses

=2a+6b-3a-9b .... group like terms

=2a-3a +6b-9b .... sum like terms

=-a-3b

=-(a+3b)

Square expression

[-(a+3b)]^2 .... ^2 means raise to 2nd power

=(-1)^2 (a+3b)^2

=(a+3b)^2 .... use identity (x+y)^2=x^2+2xy+y^2

=a^2+6b+9b^2

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