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[tex] \sqrt{21 + 12 \sqrt{3} [/tex] Nu mai stiu formula de rezolvare ajutor!!

Răspuns :

√(21+12√3)=√(21+√432)=
=√[21+√(441-432)]/2+√[21-√(441-432)]/2=
=
√(21+√9)]/2+√(21-√9)/2=
=√(21+3)/2+√(21-3)/2=
=√24/2+√18/2=
=√12+√9=
=2√3+3