anonymous
  • anonymous
Can anyone help me? Solve x2 + 9x + 20 = 0. (4 points) x = 2, x = 10 x = -2, x = -10 x = -5, x = -4 x = 5, x = 4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
9x=5x+4x
anonymous
  • anonymous
make factors
anonymous
  • anonymous
factors?

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Bee_see
  • Bee_see
think like this. what two numbers add up to 9 and equal 20 if you multiply them?
Bee_see
  • Bee_see
5 and ???
anonymous
  • anonymous
oh sorry
Bee_see
  • Bee_see
|dw:1438216512930:dw|
Bee_see
  • Bee_see
5 + n= 9 and 5 times n = 20. what's n in this case?
Bee_see
  • Bee_see
are you having trouble finding n? if so, then do this: 9-5=?? and 20/5=???
anonymous
  • anonymous
n, its 4
Bee_see
  • Bee_see
right! so it fits in both conditions!
anonymous
  • anonymous
yes
Bee_see
  • Bee_see
|dw:1438216838079:dw|
Bee_see
  • Bee_see
what's x on the left side? what's x on the right side?
anonymous
  • anonymous
-5 and -4
Bee_see
  • Bee_see
righ! that's the answer!
Bee_see
  • Bee_see
do you get it? If you only have x^2 at the beginning of your equation that you can just do this: (X___)(X____)
anonymous
  • anonymous
yeah thanks!
Bee_see
  • Bee_see
|dw:1438217003935:dw|
Bee_see
  • Bee_see
to check, you can distribute: |dw:1438217220264:dw|

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