Example Problems V — task. Mathematics CBSE, Class 9.

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Simplify the following expressions:

(i)

$(5+\sqrt{7})(2+\sqrt{5})=$

$i + i \sqrt{i} + i \sqrt{i} + \sqrt{i}$

(ii)

$(5+\sqrt{5})(5-\sqrt{5})=$

(iii)

$(\sqrt{3}+\sqrt{7})^2=$

$i + i \sqrt{i}$

(iv)

$(\sqrt{11}+\sqrt{7}$

$(\sqrt{11}-\sqrt{7}=$

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