Posted by priya on Sunday, October 17, 2010 at 9:07pm.
i need help with this quretsion ; i don't 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
4ã7(2ã3+3ã6 ã7)
=4*2*ã7*ã3 +4*3*ã7*ã6 4*ã7*ã7
=8*ã21 +12*ã42 4*ã49
=8*ã21+ 12*ã(21*2) 4*7
=8*ã21 +12*ã21+ 12*ã2 28
=4*2*ã21 +4*3*ã21 +4*3*ã2 28
=4*ã21*(2+3*ã2)28
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