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4√84-10√189-12√1029+2√525

Răspuns :

=4rad(21x4)-10rad(9x21) -12rad(21x49) + 2rad(21x25)= (rad21)*(8-30-84+10)=
-96rad21.
4√2²*3*7-10√3³*7-12√3*7³+2√3*5²*7= 4*2√21- 3*10√21-7*12√21+2*5√21=

=√21*(8-30-84+10)= - 96√21