Question

(7-root11) (7+root11)

Answer 1

Answer:

$\sf(7 - \sqrt{11} )(7 + \sqrt{11} )$

$\sf \to {7}^{2} - {11}^{2}$

$\sf \to4 9 - 11$

$\red \to \sf38$

$\huge \red{ \sf{note \ \: : }}$

$\sf(x + y)(x - y) = {x}^{2} - {y}^{2}$

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Answer 2

$: \implies (7 - \sqrt{11} )(7 + \sqrt{11} ) \\ \\ : \implies (7 - \sqrt{11} )(7 + \sqrt{11} ) \\ \\( {(x - y)(x + y) = {x}^{2} - {y}^{2} })8 \\ \\ : \implies {7}^{2} - {( \sqrt{11}) }^{2} \\ \\ : \implies 49 - 11 \\ \\ : \implies 38$

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