Solving radical equations 1 | Exponent expressions and equations | Algebra I | Khan Academy

Solving Radical Equations 1

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Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

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[kittenpimath]

I'm trying to get addicted to these videos. Watch out, school!

[david]

Great video! Keep this up, you're doing an awesome job!

[UTFort]

He is multiplying both sides by the denominator to get the variable by itself

[supercooljesse]

great video! i was wondering if anyone could tell my why he multiplies both sides by three in the 3rd step? thanks!

[Romansssz]

because it cancels out the 3 that is at bottom of square root of x

[sakinaaurelia]

Thanks! 😀
What grade do you have to learn this?

[sonha]

why do you square the 9 to 81 ? I thought you have to just take the square root of both and you get x=3

[benjaminurena]

Great video! But can anyone tell me why he adds 2 on both sides of the equation instead of subtracting 1 on both sides?

[Randomthingsshot]

Thumb if you're from Mr.Willoughbys class.