PreCalculus - Algebra Fundamental Review (20 of 80) Solving Quadratic Eqns With Square Roots

In this video I will solving the quadratic equation with radicals (square roots).

[clarissacuartero]

Your smile is so soothing to see every time. It reassures me that any problem is actually easy and even satisfying to solve. Thanks so much you're the best! :)

[Dogepenguin]

Thank You for such great videos. They serve as excellent reviews of concepts and really help me out when i forget the processes i need. Keep it up!

[heartsofgoldenrod]

Why is it that when you square both sides, you can introduce an invalid answer?

[AppleBS]

I noticed if I do it this way
-(x-5)/((x-5)^2 )=1
The final answer will be 4, which is false
Hence, why and when I cannot do it that way?