Question

(2radical din 5+radical6)la a doua-2(radical30+1)la adoua+2(4radical din 2-radical din 30)(4radical din 2+radical din30)

Answer 1

(2√5+√6)²-2(√30+1)²+2(4√2-√30)(4√2+√30)
20+4√30+6-60+4√30-2+64-60=8√30-32=8(√30-4)

Answer 2

20+4$\sqrt{30$+6-60-4$\sqrt{30$+64-60=
20+6-60+64-60=90-120=-30