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
2 answers
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
=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