Question

(3+root2) (3-root2) ​

Answer 1

Step-by-step explanation:

$(3 + \sqrt{2)} (3 - \sqrt{2} )$

$= 9 + 3 \sqrt{2} - 3 \sqrt{2} - 4$

$= 5$

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Answer 2

$\green{\bold{\underline{ ☆ UPSC-ASPIRANT ☆} }}$

$\red{\bold{\underline{\underline{QUESTION:-}}}}$

Q:-

$⟹(3 + \sqrt{2} )(3 - \sqrt{2} )$

$\huge\tt\underline\blue{ANSWER }$

⟹we use this formula here:-

$⟹ {a}^{2} - {b}^{2} = (a + b)(a - b)$

Now:-

$⟹(3 + \sqrt{2} )(3 - \sqrt{2} ) = {(3)}^{2} - { (\sqrt{2} )}^{2} = 9- 2 = 7✓$

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