anonymous
  • anonymous
Harry is trying to solve the equation y = 2x^2 − x − 6 using the quadratic formula. He has made an error in one of the steps below. Find the step where Harry went wrong.
Biology
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
apoorvk
  • apoorvk
First of all, do you know what the quadratic formula is?
anonymous
  • anonymous
Yes.

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More answers

anonymous
  • anonymous
I wrote this problem out 6 times, still can't see WHERE he went wrong.
apoorvk
  • apoorvk
What are you corresponding 'a', 'b' and 'c' for this quadratic when you compare it with the standard equation of a quadratic "ax^2 + bx +c=0"?
anonymous
  • anonymous
A = 2. B = -1. C = -6.
anonymous
  • anonymous
\[1 \pm \sqrt{-1^{2}} - 4*2*-6\]
anonymous
  • anonymous
-12 * -4 = 48. 1*1 = 1. \[1 \pm \sqrt{1-48 } \div 2\]
anonymous
  • anonymous
So it would be
anonymous
  • anonymous
Step 3?
anonymous
  • anonymous
STEP 2!!!
anonymous
  • anonymous
He + instead of -.
apoorvk
  • apoorvk
Should be : \[x = \frac{-(-1) \pm \sqrt{(-1)^2 - 4 \times 3 \times (-6) }{} }{2\times 2 }\]
anonymous
  • anonymous
No, it'd be -6.
anonymous
  • anonymous
-4 * 2 * -6.
apoorvk
  • apoorvk
actually the second step itself ha the error. (-1)^2 = 1 and yes that would be -4*2*-6 --> typo my bad.
apoorvk
  • apoorvk
*has
anonymous
  • anonymous
So, it's step 2, right?
apoorvk
  • apoorvk
Yup!
anonymous
  • anonymous
I have one more question.
apoorvk
  • apoorvk
And please ask questions in the correct subject forum :)
apoorvk
  • apoorvk
Sure, just post it as a new one!
anonymous
  • anonymous
Oh wow, I didn't realize I was in biology

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