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Since the quadratic formula is so big with a lot of plus and minus sign, not to mention the necessity of doing order of operations correctly, there is a lot of opportunity for error. One tip for reducing errors is to do as much in your head as possible. The most common mistake that comes out of students using a calculator to simplify is under the square root sign with the 4ac term. Many students accidentally use a + indstead of a  sign, or vice versa. Simplify as much in your head as possible, and only use the calculator in the final steps. When in doubt, write out every single step along the way.
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The Quadratic Formula
Problem 1 8,195 viewsSolve x² − 2x − 8 = 0 using the quadratic formula.

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Problem 2 4,992 viewsSolve using the quadratic formula:
7x² − 2x − 8 = 0 
The Quadratic Formula
Problem 3 4,729 viewsSolve x² − 2x + 2 = 0 using the quadratic formula.

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Problem 4 226 views 
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Problem 5 201 views 
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Problem 6 219 views 
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Problem 7 193 views 
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Problem 9 201 views 
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Problem 10 181 views 
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Problem 11 193 views 
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Problem 12 183 views 
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Problem 13 201 views
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