Question

(/5-1) (/5+1)
$( \sqrt{5 - 1)} ( \sqrt{5 + 1)}$
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Answer 1

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(1) (5-1)(5+1)

Formula :- (a+b)(a-b)

Therefore,

(5-1)(5+1) = (5)²- (1)²

= 25 -1

= 24

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${\bold (2) \: \: \: ( \sqrt{5 - 1)} ( \sqrt{5 + 1)}}$

Formula :- (a+b)(a-b)

Therefore,

= (√5 - √1)(√5 + √1)

= (√5)² - (√1)²

= 5 - 1

=4

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100 % correct

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