Solving quadratic equations Basic example | Math | SAT | Khan Academy

Watch Sal work through a basic Solving quadratic equations problem.

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[sofiaayesa]

We can use the calculator? Because I did it with the Quadratic mode on my calculator

[gge]

When do I use the +or - solution and when do I use the solution with either of them

[onionturtle]

Apparently I need to review square roots because that was the only part I didn't understand. The + - portion makes sense completely.