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Posted by 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 - , Sunday, October 17, 2010 at 9:35pm

    Yes, but the sqrt49 is widely known as 7

  • math grade 11 - , Sunday, October 17, 2010 at 9:59pm

    4ã7(2ã3+3ã6- 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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