anonymous
  • anonymous
how can i factor out this completely: 28b^2-80b-128?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
What is the GCF of 28, 80 and 128?
anonymous
  • anonymous
4
anonymous
  • anonymous
Factor out 4 4(7b^2 - 20b -32) What multiplies to make 7? What multiples to make 32? <------ be careful

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anonymous
  • anonymous
1*7 1*32,2*16,4*8
anonymous
  • anonymous
but that's where i'm stuck!!!
anonymous
  • anonymous
look back at the last question. I am not sure you know why they added to -38. I think you might have hurried over that part. Maybe I am wrong? For 4(7b^2 - 20b -32) we have 4(7b ?)(b ?) which ones should we choose for 32?
anonymous
  • anonymous
i don't know....
anonymous
  • anonymous
We need to get -20 If we take 4 and 8 notice 7 * 4 = 28 1 * 8 = 8 Notice 28 - 8 = 20 ^ ^ | | | | | | | multiplies to make 32 | multiples to make 7
anonymous
  • anonymous
So we chose 4 and 8 4(7b +8)(b -4)
anonymous
  • anonymous
i ssee now

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