Verified Answer :

penfila11Pen

(3 + \(\sqrt{5}\)) × (3 - \(\sqrt{5}\))
Take the special case
(a - b)×(a + b)=a² - b²

a = 3
b = \(\sqrt{5}\)

3² - (\(\sqrt{5}\))²     {(√)² = the number itself}
              9 - 5
                4 

Panoyin

(3 + √((5)) + (3 - √(5))
3(3 - √(5)) + √(5)(3 - √(5)))
3(3) - 3(√(5)) + √(5)(3) + √(5)(√(5))
9 - 3√(5) + 3√(5) - √(25)
9 - 5
4

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