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Virtual Math Learning Center

Virtual Math Learning Center Texas A&M University Virtual Math Learning Center

Quadratic Equations Video 7

Author: John Fisk

This video explains how to determine when a quadratic equation has no real solution and uses the graph to explain why this happens. It uses the following quadratic equation as an example. You can try to answer the question below before watching the video and click "Reveal Answer" to see if your answer is correct.

Problem: Show the quadratic equation \(3x^2-x+7=0\) does not have a real solution. Explain why.​

If we use the quadratic formula to solve it, we will get a \(-83\) inside the square root, which is not a real number. If we graph the quadratic, we see it never crosses the \(x\)-axis so it never equals \(0.\) Therefore, the equation has no real solution. 

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