Frostypaz1
  • Frostypaz1
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Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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samanthagreer
  • samanthagreer
i belive it is x = 4
freckles
  • freckles
5x^2+27x+28=0 5(28) is the same as 20(7) and 20+7 is 27 replace 27x with 20x+7x in your equation and then factor by grouping
freckles
  • freckles
I don't know how to do that... Never heard of it.

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freckles
  • freckles
http://www.purplemath.com/modules/factquad3.htm is this what you are doing?
freckles
  • freckles
judging by those boxes you can still use a table and what I said
freckles
  • freckles
|dw:1446929202342:dw|
freckles
  • freckles
complete the box
freckles
  • freckles
what integer times what other integer is 5?
freckles
  • freckles
@Frostypaz1 are you there?
freckles
  • freckles
well can show me what you are doing then?
freckles
  • freckles
and right 5*1 is 5 so we know sorta where to put 5x and 1x|dw:1446929838903:dw||dw:1446929879116:dw|
freckles
  • freckles
|dw:1446929923510:dw| if you wanted to learn how factor using the box method that is
freckles
  • freckles
gives (x+4)(5x+7)=0
freckles
  • freckles
by table method? if so I still don't know what table method is...
freckles
  • freckles
you could use difference of squares \[\text{ assume } a,b >0 \\ ax^2-b=(\sqrt{a} x-\sqrt{b})(\sqrt{a}x+\sqrt{b})\]
freckles
  • freckles
or another way is to add 95 on both sides then divide both sides by 5
freckles
  • freckles
and then take square root of both sides
freckles
  • freckles
this will give you two solutions
freckles
  • freckles
\[5x^2-95=0 \implies 5x^2=95 \implies x^2=\frac{95}{5} \implies x=\pm \sqrt{\frac{95}{5}}\] and yes it does look like 95 divided by 5 is 19
Frostypaz1
  • Frostypaz1
okay, thanks!
freckles
  • freckles
np

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