Question

simplyfy(-3+root5)(-3-root5)​

Answer 1

Answer:

$( - 3 + \sqrt{5} )( - 3 - \sqrt{5} ) \\ \\ formula \: to \: be \: used \\ \\ {a}^{2} - {b}^{2} \\ \\ = (a + b)(a - b) \\ \\ here \: a \: = - 3 \\ \\ and \: b = \sqrt{5} \\ \\ ( - 3) ^{2} - ( \sqrt{5} ) ^{2} \\ \\ = 9 - 5 \\ \\ = 4$

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Answer 2

(-3+√5) (-3 - √5)

(-3)² - (√5)²

[ identity: (a+b)(ab)= a²-b²]

9 - 5

4

answer is 4

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