Otherwise, you've come to the right place! The great thing about hte quadratic formula is that you can use it even when the problem cannot be factored. GradeA will make this go from complicated formula to a piece of cake. We use simple explanations, complete with colors to make the formula really come to life. Enjoy!
The Quadratic Formula (don't worry, we explain how to use it)
Free quadratic equation solver:
What do the letters a, b, and c mean?
These letters represent the coefficients of the x2, x and the constant of the quadratic equation, respectively. For clarity, we use colors to represent the different coefficients: red (x2), blue (x), green (constant).
A coefficient is the number in front ("attached") to the letter.
If there is no coefficient, it means it should be 1.
Example: The coefficient of x2 is 1.
What does the symbol + mean?
The symbol + means you perform both operations, add and subtract.
Example: 5 + 3
Add: 5 + 3 = 8
Subtract: 5 - 3 = 2
The Answer: 8 or 2
This means that when you solve equations using quadratic formula, you should come up with two answers for x.
Example: Solve Equations using Quadratic Formula
We will use the problem from above: x2 + 5x + 6 = 0
Look at the values for a, b, and c: a = 1, b = 5, c = 6.
Now all we need to do is "plug" the values into the formula: