UPSKILL MATH PLUS

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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) \((\sqrt{11}+\sqrt{7}\)\((\sqrt{11}-\sqrt{7}=\)