anonymous
  • anonymous
what are the zeros of f(x)=x^4-7x^3+15x^2-9x?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
To fnd zeros, f(x)=0 x^4-7x^3+15x^2-9x=0
anonymous
  • anonymous
Now, SOLVE FOR x can u?
anonymous
  • anonymous
I don't remember can you show me how please

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anonymous
  • anonymous
Try to factor x^4-7x^3+15x^2-9x
anonymous
  • anonymous
oh okay I remember what to do now!
anonymous
  • anonymous
Can you show me how to factor that like I remember what to do once you find X but I'm not so great at factoring 4terms and 3terms..
anonymous
  • anonymous
x^4-7x^3+15x^2-9x =x(x^3 -7x^2+15x-9) =x{ x^3 -x^2 -6x^2 +6x +9x-9} =x{ x^2(x-1) -6x(x-1) +9(x-1)} =x{(x-1)(x^2-6x+9)} =x(x-1){ x^2 -2*x*3+3^2} =x(x-1)(x-3)(x-3)
anonymous
  • anonymous
Now, can u do the rest?
anonymous
  • anonymous
Yes! Thank You so much! The X on the outside is equal to? 0
anonymous
  • anonymous
yes
anonymous
  • anonymous
Yay okay thank you!
anonymous
  • anonymous
welcome

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