Question

(Root11-root7)(root 11+root7

Answer 1

here by using identity ...we get the answer

Answer 2

$Value \: of \: (\sqrt{11} - \sqrt{7}) (\sqrt{11} + \sqrt{7})\\= (\sqrt{11})^{2} - (\sqrt{7})^{2}$

$\underline {\blue { By \: Algebraic \:Identity :}}$

$\boxed { \pink { ( a + b )( a - b ) = a^{2} - b^{2} }}$

$= 11 - 7 \\= 4$

Therefore.,

$\red{Value \: of \: (\sqrt{11} - \sqrt{7}) (\sqrt{11} + \sqrt{7})} \\\green {= 4}$

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