Extraneous solutions of radical equations (example 2) | High School Math | Khan Academy

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Sal finds the value of d for which √(3x+25)=d+2x has an extraneous solution at x=-3.

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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Комментарии
Автор

I'm not shure but i think that d^2 + 4dx + 4x^2 is right?

Bewerterify
Автор

Sal, why would you post erroneous lessons, there really are too many.

dovidshiv