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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

Yes, but the sqrt49 is widely known as 7

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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