Example 2: Completing the square | Quadratic equations | Algebra I | Khan Academy

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Completing the Square 2

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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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Well done! One of the better khan videos that help unravel the confusion.

linyuan
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what if it was positive 45, what then?

madzdon
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at 2:40 it is unclear as to how x squared + 10x + 25 = (x+5) squared like where did the 10x go or why would 10x be enough to square the x a second time? Stuck on that.

perfekt
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I had no idea Eliot Gould was such a maths wiz

KimMoth
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Wait
-10+- the square root of -180/2

Oh nvm

Blindboard
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Woah woah woah. You're subtracting a 25 when you added on the other side??? That's not how it works! You're supposed to do the SAME on both sides!
This is making me more confused ;^;

rainetopia