Qudratic Formula

[Matlynn Giles 2E]

On Sapling HW question #2 I have my Ka as .000429 with .142M of acid. Everytime I use the quadratic formula I recieve an error.

[Halle Villalobos 3E]

Hi! I would suggest double-checking your work before you plug in your values into the quadratic formula. To make the process more efficient, I would suggest uploading the program QUADFORM onto your calculator, if you haven't already. That way, you can directly input values that were previously calculated on the calculator. Here is a video that shows you how to do it: https://www.youtube.com/watch?v=EnJLKU-WjJI
I hope this helps!

[Jamie2002]

This quadratic formula calculator can also be used to check your work: https://www.mathpapa.com/quadratic-formula/

[Juliet Carr 1F]

I would also suggest graphing the quadratic equation on your calculator and then finding the zeros that way for the values of x because it is very easy to make mistakes when inputing the quadratic formula on a calculator due to signs, correct parentheses use, square root, etc.

[Samantha Low 3D]

When using the quadratic formula, I always try to double check that the value inside the square root is never negative. Writing the formula out on paper before I plug it into my calculator helps

[Katelyn_Ortega_1D]

If you wanna check your work use this calculator!
https://www.calculatorsoup.com/calculat ... ulator.php

[Kylie Joe 2A]

I would also suggest making sure that using the quadratic formula is really the most efficient way to solve the problem! Could be that you're missing out on simplifying part of the answer, and that is why the equation isn't working as expected. If none of this works, check the Solutions Manual Mistakes pdf. Maybe you're not wrong after all!

[Karen Elrayes 1L]

You can also try graphing the equation, and calculating where the x-intercepts are if you have a graphing calculator.

[DavidTabib 3H]

I use a quadratic root finder online to check my work.

[Jack_Pearce_2H]

I would make sure you have all the right equation with all the proper parameters. Make sure you do the equation twice by twice with the (+) and (-) sign after the -b term and before the square root.

[Jack Kettering 3D]

Since I believe we will be allowed to use graphing calculators I would suggest just graphing your equation and finding the positive zero value for x as this is much easier in my opinion.

[Rachel Kho Disc 2G]

My most common mistakes whenever I get back that the calculator has received an error have been that I inputted a number wrong, I forgot to add plus and minus signs when necessary, or I forgot to square b. So definitely check to make sure that these aren't your problems!

[Hannah Chang 3K]

most scientific calculators have embedded program to solve quadratic formula, you could try to practice using it

[Lauren Mungo 1K]

I would suggest writing out every step to avoid error if you do not use a program to calculate your answer. Making sure all the number are correct starting from the ICE table all the way through is a good way to check your work.

[Maryeli Garay 2H]

I would suggest using an online quadratic calculator to check your homework answers, but for sure be comfortable using a handheld calculator to solve problems like these because that's what we can use on the exams! :)

[LeahSWM 2E]

Sometimes you have to use a lot of parentheses in order for it to work. I got fed up and just used a quadratic formula calculator online and saved me the time and trouble.

[Charlotte Chen 3B]

I would be mindful of negative signs in particular when plugging in values into the quadratic formula, because sometimes if your value is already negative it can be easy to forget there is another negative sign in front of it that will cancel it out. When you say error do you mean two negative roots or are you using a quadratic formula calculator? If you are using a calculator to check, sometimes you need to sub in the exact values (not rounded ones) for it to work, so I would suggest plugging in the expression of the multiplied values. Usually two negative roots is an indicator that there was a calculation error earlier, either when plugging in the values to the quadratic equation or beforehand so I would redo the calculations and also make sure when you're putting the values into your calculator to use parentheses too e.g. -(-x) to avoid possible error

[Carlos Martinez 2K]

have you tried to factor out?

[Susan Chamling 1F]

Make sure you have all of your terms in the correct order and on the same side. If you move a term to the opposite side, remember to change the sign from positive to negative, or vice versa. Also don't forget about the denominator, 2a. When I use the quadratic formula I enter it in parts on my calculator to prevent typing errors that would cause a miscalculation. Usually this means solving for what is within the square root, then adding and subtracting it from the -b, and then finally including the denominator.

[Lilly Catarozoli 1B]

It could just be an algebra mistake. A lot of times it can be hard to type everything into the calculator correctly (I have made simple mistakes from this before!)