1. ## [SOLVED] Quadratics setting on cacluator

Hi,

I am trying to work out some quadractic equations when I compare the my answer to the answer book it is wrong. I even typed in the exact example they gave me. My calculator screen is attached is it in the right settings?

Thanks

2. Originally Posted by TheHour
Hi,

I am trying to work out some quadractic equations when I compare the my answer to the answer book it is wrong. I even typed in the exact example they gave me. My calculator screen is attached is it in the right settings?

Thanks
Why are you using a calculator to solve a quadratic equation? Just factor the thing or use the quadratic formula.

3. I need the calculator for the formula

When I substitute a, b and c the answer is I get on my calculator is different to the answer in the answer book I know the theory is correct. Would you like to see my workings

Thanks

4. Originally Posted by TheHour
I need the calculator for the formula

When I substitute a, b and c the answer is I get on my calculator is different to the answer in the answer book I know the theory is correct. Would you like to see my workings

Thanks
That would be nice.

5. Here it is

Thanks

6. Originally Posted by TheHour
Here it is

Thanks

$\displaystyle \frac{-5+\sqrt{17}}{2}=-.438$

$\displaystyle \frac{-5-\sqrt{17}}{2}=-4.562$

7. So its my calculator as I worked out

$\displaystyle \frac{-5+\sqrt{17}}{2}$

$\displaystyle \frac{-5-\sqrt{17}}{2}$

on my calculator and it gave me the results in the image above. The settings on the caluclator are in my first post, im sure I have reset the settings by mistake. Looks like my method is fine though just the working out wich wasn't even done by me

Thanks

8. Originally Posted by TheHour
So its my calculator as I worked out

$\displaystyle \frac{-5+\sqrt{17}}{2}$

$\displaystyle \frac{-5-\sqrt{17}}{2}$

on my calculator and it gave me the results in the image above. The settings on the caluclator are in my first post, im sure I have reset the settings by mistake. Looks like my method is fine though just the working out wich wasn't even done by me

Thanks
You have to be careful when you enter things in a calculator. You probablly did not pair all your parentheses. Try it this way:

Be sure to put the entire numerator in parentheses before you divide by 2.

My solutions in Post #6 are correct. What does your book say?

9. You where correct as the answers say -0.438 or -4.562.

While typing this I remember the way I am working it out I need brackets, im not typing it in as a fraction as you did, im just doing it as one line, doh. All fixed