anonymous
  • anonymous
Quadratic Formulas - 10 questions tried 6 times and failed epically. just don't get it. 1) When the sum of 5 and twice a positive number is subtracted from the square of the number, 0 results. Find the number. 2) 2/5x^2 -x+ 19/15 =0 3) .6x^2 = 1.2x +0.6 4) A rule for estimating the number of board feet of lumber that can be cut from a log depends on the diameter of the log. To find the diameter required to get 121 board ft of lumber, the equation (d-4/4)^2 = 121. are both answers reasonable? 5) 9x^2 -7x -5=0 6) 5x^2 - 2x +13 = 18x +1 7) 6p^2 = -19p -3 8) 5x^2 = -20x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
9) I can do this one :) 10) 5x^2 = 3 +2x
hybrik
  • hybrik
Do you know the quadratic formula?
anonymous
  • anonymous
ax2 + bx +c = 0

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anonymous
  • anonymous
x^2
hybrik
  • hybrik
You have to put it in that form for the quadratic formula.
anonymous
  • anonymous
I did 8&9
anonymous
  • anonymous
oh the x = -b (sqrt b-4(a)(c))/ 2(a)
hybrik
  • hybrik
Yes, \[x =\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a}\]
hybrik
  • hybrik
you have to plug in the points.
hybrik
  • hybrik
Try #1.
anonymous
  • anonymous
x^2 + 2x+5=0 ?
hybrik
  • hybrik
To do this, you can plug in the points to get:
hybrik
  • hybrik
wait keep in mind if it is just x^2, the value is 1
hybrik
  • hybrik
Okay so you would have \[x=\frac{ -2\pm \sqrt{(2)^2-4(1)(5)} }{ 2(1) }\]
anonymous
  • anonymous
I gtg, will be on tomorrow can you help then?
anonymous
  • anonymous
no available computer till tomorrow
hybrik
  • hybrik
Okay.
anonymous
  • anonymous
Thank You so much. Very appreciated
hybrik
  • hybrik
Your welcome.
anonymous
  • anonymous
um...so did you still want to help me? lol
pooja195
  • pooja195
Can you make a post for each question so its easier to help? .-.
anonymous
  • anonymous
I mean, yeah I can lol.
pooja195
  • pooja195
Thanks :3

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