(9+4√3)*(9-4√3)= 9²-(4√3)²= 81-48= 33
√6(13+3√6)= 13√6+18
(√11-4√7)²= 11-8√77+112= 123-8√77
(√3+5)²= 3+10√3+25= 28+10√3
(√11+√5)²= 11+2√55+5= 16+2√55
5√x+7√x-6√x= 6√x
x²+4√5x+6
(√5+1)²+4√5(√5+1)+6= 5+2√5+1+20+4√5+6= 32+6√5
(9+4√3)*(9-4√3)= 9²-(4√3)²= 81-48= 33
√6(13+3√6)= 13√6+18
(√11-4√7)²= 11-8√77+112= 123-8√77
(√3+5)²= 3+10√3+25= 28+10√3
(√11+√5)²= 11+2√55+5= 16+2√55
5√x+7√x-6√x= 6√x
x²+4√5x+6
(√5+1)²+4√5(√5+1)+6= 5+2√5+1+20+4√5+6= 32+6√5