(√3-√5)*√ (8+2√15)= (√3-√5)* √ (√3²+2√(3*5) +√5²) =
= (√3-√5)*√ (√3+√5)²=
= (√3-√5)* (√3+√5)= √3²-√5²=3-5 = - 2
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(√3-√5)*√ (8+2√15)= (√3-√5)* √ (√3²+2√(3*5) +√5²) =
= (√3-√5)*√ (√3+√5)²=
= (√3-√5)* (√3+√5)= √3²-√5²=3-5 = - 2