兩條因式分解數學題,快!!!!?

2016-10-17 1:07 pm
1. 48+24(2m-1)+3(2m-1)2次方
2. a2次方-4b2次方+12b-9
plz list steps

回答 (2)

2016-10-17 1:15 pm
1. 48+24(2m-1)+3(2m-1)^2
Set p=2m-1
48+24(2m-1)+3(2m-1)^2
=3p^2+24p+48
=3(p^2+8p+16)
=3(p+4)^2
-3(2m-1+4)^2
=3(2m+3)^2
2. a^2-4b^2+12b-9
=a^2-(4b^2-12b+9)
=a^2-(2b-3)^2
=(a-2b+3)(a+2b-3)
2016-10-18 10:09 am
1
48+24(2m-1)+3(2m-1)^2
=3[16+8(2m-1)+(2m-1)^2]
=3(2m+3)^2

2.
a^2-4b^2+12b-9
=a^2-(2b-3)^2
=(a+b-3)(a-b+3)


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