URGENT ALGEBRA HELP!?

[匿名]

2016-09-12 3:43 am

Given x^2+y^2=36 and xy=-10 find x+y. Thanks!

回答 (2)

用戶57799

2016-09-12 3:46 am

(x+y)^2 = x^2+y^2+2xy = 36-20 = 16
x+y = 4 or -4

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用戶57802

2016-09-12 3:44 am

(x+y)^2=16--->x+y = ...

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收錄日期: 2021-04-21 21:53:15
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