PDF chapter test TRY NOW

Simplify the following expressions:
 
(i) (5+\sqrt{7})(2+\sqrt{5})= i+ii+ii+i
 
(ii) (5+\sqrt{5})(5-\sqrt{5})=
 
(iii) (\sqrt{3}+\sqrt{7})^2=i+ii
 
(iv) (\sqrt{11}+\sqrt{7}(\sqrt{11}-\sqrt{7}=