College Algebra / Unit 4 Alg 203 short lesson, about 20 seconds
The Square Root Property
Captions available
The idea
The square root property states that x² = k has two solutions, x = √k and x = −√k, written x = ±√k.
In practice
x² = 9 gives x = ±3: 3² and (−3)² land on 9. The radical names one root; the equation owns two.
Where people slip
The ± belongs to the equation, not to the radical.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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