Graphing a circle from its standard equation | Mathematics II | High School Math | Khan Academy

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Sal graphs the circle whose equation is (x+5)²+(y-5)²=4.

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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This guy has such an immaculate brain.

Vanessa-ygqr
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why does the -5 turn into - - 5? I assume it's because you would equal the first X+5 to zero. x+ 5 = 0. to which it will become x = -5. is this correct?

broccoli_lad
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Error @1:35 (update to: "is equal to 4.").

johnsincak