Question

EFECTUATI:
a)(√3-√5)²
b)(2√7+1)²
c)(3-√7)²
d)(3√2+2√5)²
ajutatima va rog frumos urgent

Answer 1

$( \sqrt{3}- \sqrt{5})^{2}=( \sqrt{3}- \sqrt{5})( \sqrt{3}- \sqrt{5})=3- \sqrt{15}- \sqrt{15}+5=8-2 \sqrt{15}$
$(2 \sqrt{7}+1)^{2}=(2 \sqrt{7}+1)(2 \sqrt{7}+1)=28+2 \sqrt{7}+2 \sqrt{7}+1=29+4 \sqrt{7}$
$(3- \sqrt{7})^{2}=(3- \sqrt{7})(3- \sqrt{7})=9-3 \sqrt{7}-3 \sqrt{7}+7=16-6 \sqrt{7}$
$(3 \sqrt{2}+2 \sqrt{5})^{2}=(3 \sqrt{2}+2 \sqrt{5})(3 \sqrt{2}+2 \sqrt{5})=12+6 \sqrt{10}+6 \sqrt{10}+20$=$32+12 \sqrt{10}$