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Verified answer
√{(a+b) + 2√(a.b)} = √a + √b√{(a+b) - 2√(a.b)} = √a - √b
nah itu dasarnya
√{21 + 8√5} = √{21 + 2.4√5} = √{21 + 2√(16.5)}
= √{(16+5) + 2√(16.5)}
= √16 + √5
= 4 + √5
√{8 - √60} = √{8 - √(4.15)}
= √{8 - 2√15}
= √{(5+3) - 2√(5.3)}
= √5 - √3
maka
= 4 + √5 - (√5 - √3)
= 4 + √3