anonymous
  • anonymous
with quadratic equations how do I know when to add or subtract!
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Where are you asking about adding or subtracting?
anonymous
  • anonymous
well with \[1\pm \sqrt{1^2 -4(1)(-4)} \] would this be a situation to add since a neg 4 times a neg 4 is a positive 16
anonymous
  • anonymous
Yes. You would add.

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anonymous
  • anonymous
okay beacuse in my math book there is a similar one and they subtracted. it was \[-2 \pm \sqrt{2^2 - 4(5)(-2)} \over 2(5)\]
anonymous
  • anonymous
Well, you add inside the square root for both cases because you're multiplying two negative numbers together.
anonymous
  • anonymous
right but the answer in the book depends on it being subtracted. So is the book just plain wrong?

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