anonymous
  • anonymous
i will medal and fan you! 1.(–10x3 + 30x – 20) ÷ (–5x + 5) 2.(8m7 – 10m5) ÷ 2m3 3.(–6m9 – 6m8 – 16m6) ÷ (2m3) these kinds of questions confuse the heck out of me please help and explain(:
Mathematics
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chestercat
  • chestercat
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ajprincess
  • ajprincess
is ur first question? .(–10x3 + 30x – 20) ÷ (–5x + 5) or else .(–10x2 + 30x – 20) ÷ (–5x + 5)?
ajprincess
  • ajprincess
@FullHouseSquidy
anonymous
  • anonymous
these are the questions. sorry i wrote them down wrong: (-10x^3+30x-20) / -5x+5 (8m^7 – 10m^5) ÷ 2m^3 (–6m^9 – 6m^8 – 16m^6) ÷ (2m^3)

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ajprincess
  • ajprincess
Let us try to do the first question. Can u factorise (-10x^3+30x-20)?
anonymous
  • anonymous
no you cant
ajprincess
  • ajprincess
\(-10x^3+30x-20=-10x^3+3*10x-2*10\) do u see anything common to all three terms?
anonymous
  • anonymous
10
ajprincess
  • ajprincess
right:) when u factor it out what remains?
anonymous
  • anonymous
-2^3+3-2?
anonymous
  • anonymous
oh wait its -z^3+3-2
ajprincess
  • ajprincess
\(-10x^3+3*10x-2*10=10(-x^3+3x-2)\) getting it?
anonymous
  • anonymous
yeah i get that
ajprincess
  • ajprincess
good:) Can u factorise -5x+5?
anonymous
  • anonymous
-5(x+1)
ajprincess
  • ajprincess
-5x+5=-5(x-1)
anonymous
  • anonymous
oh ok
ajprincess
  • ajprincess
\[\frac{ -10x^3+30x-20 }{ -5x+5 }=\frac{ -10(x^3-3x+2) }{ -5(x-1) }=\frac{ -5*2( x^3-3x+2) }{ -5(x-1) }\] do u see anything common in both denominator and numerator?
anonymous
  • anonymous
the -5 and x?

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