Factorize the following expression

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2008-01-11 1:38 am

Quick Maths!

Factorize the following expression by using identity of difference of two squares.

18a2 +15b -50b2 -9a

回答 (2)

myisland8132

2008-01-11 1:44 am

✔ 最佳答案

18a2 +15b -50b2 -9a
=2(3a)^2-2(5b)^2-9a+15b
=2[(3a)^2-(5b)^2]-3(3a-5b)
=2[(3a+5b)(3a-5b)]-3(3a-5b)
=(3a-5b)[2(3a+5b)-3]
=(3a-5b)(6a+10b-3)

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用戶92342

2008-01-13 3:37 am

18a2 +15b -50b2 -9a
=2(3a+5b)(3a-5b)+3(5b-3a)
=(3a-5b)(6a+10b+3a+5b)
=(3a-5b)(9a+15b)
=3(3a+5b)(3a-5b)

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