Question

EX 22
CALCULATI
A)$( \sqrt{7} + \sqrt{3) ^{2} -2 \sqrt{21}$
B)$( \sqrt{6} - \sqrt{3} ) ^{2} -(1- \sqrt{3)} ( \sqrt{3} +1)+3( \sqrt{2} +1) ^{2}$
C)$(1- \sqrt{7} )( \sqrt{7} +1)-( \sqrt7+ \sqrt{14} )^{2} +3( \sqrt3}+ \sqrt{6) ^{2} }$

Answer 1

b) 6+3-2.3√2-(1-3)+3(2+1+2√2)=9-6√2+2+3(3+2√2)=11+9-6√2+6√2=20
c) (1-7)-(7+14+2.7√2)+3(3+6+6√2)=-6-21-14√2+27+18√2=6√2
a) daca am inteles bine
(√7+√3)²-2√21=7+3+2√21-2√21=
=10