Question

(9-root3) (9+root3)
$(9 - \sqrt{3} )(9 + \sqrt{3})$
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Answer 1

Answer:

$(9 - \sqrt{3} )(9 + \sqrt{3} ) \\ \\ \\ here \: we \: use \: (a + b)(a - b) = {a}^{2} - {b}^{2} \\ \\ \\ = {9}^{2} - { \sqrt{3} }^{2} \\ \\ \\ = 81 - 3 \\ \\ \\ = 79$

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