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(√3-√2a)(3+2a)(√3+√2a)
(3-2a)(3+2a)=9-4a²
9-4*(√5)²=-11
odp.A.
zad.12
a) (3√5-2√7)(3√5+2√7)=45-28=17
b) (2√3-3√2)(2√3+3√2)=12-18=-6
c) (5√3-3√5)(5√3-3√5)=75-45=30
d) (7√5-5√7)(7√5+5√7)=245-175=70
odp.B.