Answer:20
Step-by-step explanation:
=>(5+√5)(5-√5)
=>5(5-√5)+√5(5-√5)
=>25-5√5+5√5-5
=>25-5
=>20
Answer:
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Step-by-step explanation:
(5+√5) (5-√5)
or using identity
(a+b)( a-b )= (a)²- (b)²
(5)²- (√5)² = 25 - 5=20
