中二數學題

2012-10-01 1:02 am

Factorize the following expressions.
2(a+2b)平方-24(a+2b)+72
要步驟!!!

回答 (3)

2012-10-01 2:47 am

✔ 最佳答案

Factorize the following expressions.
2(a+2b)^2 -24(a+2b)+72

2(a+2b)^2 -24(a+2b)+72
=2 [(a+2b)^2-12(a+2b)+36]
=2 [(a+2b)-6]^2
=2 (a+2b-6)^2 #

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2012-10-01 1:43 am

Let x be a+2b
2x^2-24x+72
=2(x^2-12x+36)
=2(x-6)^2
=2(a+2b-6)^2 //

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2012-10-01 1:08 am

2(a+2b)平方-24(a+2b)+72

=(2a+4b)平方-24a-48b+72

=4a平方+16b平方-24a-48b+72

參考: 自己

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