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anonymous

  • 5 years ago

with quadratic equations how do I know when to add or subtract!

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  1. anonymous
    • 5 years ago
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    Where are you asking about adding or subtracting?

  2. anonymous
    • 5 years ago
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    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

  3. anonymous
    • 5 years ago
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    Yes. You would add.

  4. anonymous
    • 5 years ago
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    okay beacuse in my math book there is a similar one and they subtracted. it was \[-2 \pm \sqrt{2^2 - 4(5)(-2)} \over 2(5)\]

  5. anonymous
    • 5 years ago
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    Well, you add inside the square root for both cases because you're multiplying two negative numbers together.

  6. anonymous
    • 5 years ago
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    right but the answer in the book depends on it being subtracted. So is the book just plain wrong?

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