What are quadratic equations in mathematics?

In mathematics, quadratic equations refers to an equation of the form ax² + bx + c = 0 where the highest power of the unknown is two. It matters because the same idea reappears across many later topics, so building a clear mental picture of it early saves a lot of time.

How to approach it step by step

To work with quadratic equations confidently, factorise when the roots are rational, otherwise use the quadratic formula x = (−b ± √(b² − 4ac)) / 2a. LetMeTeach draws this out live on screen while explaining it aloud, so you watch each part appear instead of decoding a static block of text. You can interrupt at any point and ask for the same idea again in simpler words, in another language, or with a different example.

Worked example

For x² − 5x + 6 = 0, factorising gives (x − 2)(x − 3) = 0, so x = 2 or x = 3.

The mistake most learners make

Forgetting that a negative discriminant means there are no real roots, only complex ones.

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