8.
c) (√10-1)²=10-2√10+1 =11-2√10
f) (√7-√6)²=7-2√42+6=13-2√42
i) (√14-√7)²=14-2√98+7=14-14√2+7=21-14√2
9.
c) (√3-7)(√3-7)=(√3)²-(√7)²=√9-√49 =9-7=2
f) (√7+4)(√7-4)= (√7)²-4²= √49-16 = 7-16 =-9
i) (4-√6)(4+√6)=4²-(√6)²= 16-√36= 16-6=10
10
c) (√10-3)²+√20+√18=10-6√10+9+2√5+3√2 = 19-6√10+2√5+3√2
f) (√6-√3)²+(√2-1)(√2+1)= 6-2√18+3+2-1=6-6√2+3+2-1=10-6√2
