(√3 + √7).(√3 - √7) / 2√5 + √2

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bentuk akar

(√3 + √7)(√3 - √7) / ( 2√5 + √2)=
= (3 - 7) (2√5 - √2) /.(2√5√ + √2)(2√5 - √2)
= (-4) (2√5 - √2)/ (20 - 2)
= (4/18( 2√5 - √2)
 = (2/9)(2 √5 - √2)