anonymous
  • anonymous
z^2-2z-42=(2z+7)(z-6)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Directrix
  • Directrix
Checking your factoring? Or, what are the instructions?
anonymous
  • anonymous
It says Solve... it is factoring. I need the smallest answer for z, the middle answer for z and then the largest answer for z
Directrix
  • Directrix
This looks like a quadratic to me. If so, expect 2 roots. Maybe you need the coefficients. Let's see.

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anonymous
  • anonymous
Yea I am sure it is a quadratic... really its just a pain
anonymous
  • anonymous
|dw:1330659883200:dw|
Directrix
  • Directrix
Yes, but you still have to multiply it out. See if you get 3z - z^2 = 0 with roots of 0 and 3.
Directrix
  • Directrix
-z^2 + 3z + 0 = 0 What do you mean by smallest z, middle z, and biggest z?
anonymous
  • anonymous
well there should be 3 answers for z
anonymous
  • anonymous
when you set them equal to 0 but I dont know how to get them set to 0
Directrix
  • Directrix
-z^2 + 3z + 0 We agreed that there are two values for z because the equation is a quadratic You keep talking about THREE values of z. Not possible. For coefficients of the equation obtained by multiplying, there are THREE coefficients. -1, 3 and 0. They are NOT roots.
Directrix
  • Directrix
If you show me the test form you are completing, I can understand what you need from all this.
anonymous
  • anonymous
z2 + 2z − 42 = (2z + 7)(z − 6) z = . (smaller value) z = . (larger value)
Directrix
  • Directrix
z = . (smaller value) = zero 0 z = . (larger value) = three 3
anonymous
  • anonymous
Okay but how did you do that.....

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