Posted by **priya** on Sunday, October 17, 2010 at 9:07pm.

i need help with this quretsion ; i dont know if im right, and i dontknwo what do next

question expand and simplfy:

4√7(2√3 + 3√6 - √7)

my work

= 8√21 + 12√42 -4√49

please help me

- math grade 11 -
**bobpursley**, Sunday, October 17, 2010 at 9:35pm
Yes, but the sqrt49 is widely known as 7

- math grade 11 -
**Bosnian**, Sunday, October 17, 2010 at 9:59pm
47(23+36- 7)

=4*2*7*3 +4*3*7*6 -4*7*7

=8*21 +12*42 -4*49

=8*21+ 12*(21*2) -4*7

=8*21 +12*21+ 12*2- 28

=4*2*21 +4*3*21 +4*3*2 -28

=4*21*(2+3*2)-28

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