Question

ex 1;2;3;4;5 urgent foarte

Answer 1

1) (√3+√5)²2(√15-√21-√35)=
(√3²+√5²)(2√15-2√21-2√35)=
(√9+√25)(2√15-2√21-2√35)=
(3+5)(7,74-9,16-11,83)=
8×(-1,48)-11,83=
-11,36-11,83=-23,19.
2)nu stiu scuze.
3) a)3a²x-6ax²=9ax-36ax=-27ax
b) (x+3)²-2x-6=x²+3²-2x-6=x²+9-2x-6=x²+2x=9+6=3x²=15=x²=15/3=5=x=5²=25.