Question

the value of (4+√5)(4-√5)​

Answer 1

Answer:

$(4 + \sqrt{5} )(4 - \sqrt{5} )$

using identity :

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

$( {4})^{2} - ( \sqrt{5})^{2}$

$16 - 5$

$11$

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