## careless850 Group Title 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. 2 years ago 2 years ago

1. careless850 Group Title

2. apoorvk Group Title

First of all, do you know what the quadratic formula is?

3. careless850 Group Title

Yes.

4. careless850 Group Title

I wrote this problem out 6 times, still can't see WHERE he went wrong.

5. apoorvk Group Title

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"?

6. careless850 Group Title

A = 2. B = -1. C = -6.

7. careless850 Group Title

$1 \pm \sqrt{-1^{2}} - 4*2*-6$

8. careless850 Group Title

-12 * -4 = 48. 1*1 = 1. $1 \pm \sqrt{1-48 } \div 2$

9. careless850 Group Title

So it would be

10. careless850 Group Title

Step 3?

11. careless850 Group Title

STEP 2!!!

12. careless850 Group Title

13. apoorvk Group Title

Should be : $x = \frac{-(-1) \pm \sqrt{(-1)^2 - 4 \times 3 \times (-6) }{} }{2\times 2 }$

14. careless850 Group Title

No, it'd be -6.

15. careless850 Group Title

-4 * 2 * -6.

16. apoorvk Group Title

actually the second step itself ha the error. (-1)^2 = 1 and yes that would be -4*2*-6 --> typo my bad.

17. apoorvk Group Title

*has

18. careless850 Group Title

So, it's step 2, right?

19. apoorvk Group Title

Yup!

20. careless850 Group Title

I have one more question.

21. apoorvk Group Title

22. apoorvk Group Title

Sure, just post it as a new one!

23. careless850 Group Title

Oh wow, I didn't realize I was in biology