15.(3√5 - √10)² = (3√5)² + (√10)²-2.3√5.√10
= 9.5 + 10 - 6.√50
= 55 - 6.5√2
= 55 - 30√2
= 5(11 - 6√2)
16. 8/(√5 + 3) = 8/(√5 + 3) . (√5 - 3)/(√5 - 3)
= 8.(√5-3)/(5-9)
= -8(√5-3)/4
= -2(√5-3)
= 2(3-√5)
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15.(3√5 - √10)² = (3√5)² + (√10)²-2.3√5.√10
= 9.5 + 10 - 6.√50
= 55 - 6.5√2
= 55 - 30√2
= 5(11 - 6√2)
16. 8/(√5 + 3) = 8/(√5 + 3) . (√5 - 3)/(√5 - 3)
= 8.(√5-3)/(5-9)
= -8(√5-3)/4
= -2(√5-3)
= 2(3-√5)