Example 2: Finding the square of a binomial with one variable | Algebra I | Khan Academy

Multiply (7x+10)*(7x+10), also known as (7x+10)^2.

Missed the previous lesson?

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.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Algebra channel:

[lucaswilliams]

Can someone explain what I'm doing wrong here? I tried doing this problem assuming that x = 4 and came to 1, 444 since 7 * 4 is 38 and 38^2 is 1444. But if you look at his equation where it simplifies to 49x^2 +140x + 100 and substitute x with 4 you get 39076.

[danib]

I don't know man, it was clear to me. Thank you.

[whosfredol]

Noted thanks a lot! Also... wow am I the only one here from 2022? I guess I'm going to be history too.

[Ezreell]

Well basically where the heck you get the 100 ? you havent explained it

[kngjohnny]

How did you get the 2 sir?? Can someone explain?

[yorkie]

hahah and i'll make sure to write that in CAPS(;

[charleslouiscedeno]

make this very confusing, no need to waste time showing the wrong way just show the right way.  That will help keep it clear