simplify the expression
1 ) ( 3√x － 2√y ) ( 3√x ＋ 2√y )
2 ) (√x＋ √y ) (√x － √y )
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1 Maths Question...
2008-09-05 12:54 am
回答 (1)
2008-09-05 1:06 am
✔ 最佳答案
Formula used: (a + b)(a - b) = a2 - b21 )
(3√x - 2√y)(3√x + 2√y)
= (3√x)2 - (2√y)2
= (3)2(√x)2 - (2)2(√y)2
= 9x - 4y
2)
(√x + √y)(√x - √y)
= (√x)2 - (√y)2
= x - y
=
收錄日期: 2021-04-25 14:04:10
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