Difference of squares intro | Mathematics II | High School Math | Khan Academy

When an expression can be viewed as the difference of two perfect squares, i.e. a²-b², then we can factor it as (a+b)(a-b). For example, x²-25 can be factored as (x+5)(x-5). This method is based on the pattern (a+b)(a-b)=a²-b², which can be verified by expanding the parentheses in (a+b)(a-b).

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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[emilyhannold]

Great video, and how ironic that im learning this in class and have a test soon.
It's easier of you just do the square root of the number.

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[simonewright]

Thank you! So helpful and pretty direct

[ujararisamuraranganda]

Thanks for the help. It helped me alot

[alejandromarquez]

What if the variable has a number in front of it for example like 9x^2-1?

[whosbusii]

Sir could u pls do difficult ones like 25a² – 16 + (5a–4)(a–2)

[arnavkonduru]

thank you so much i would have failed the test without this

[Victor-qezg]

What if there are three terms?

Such as Ax^2 - x - B for example, and B isn't a perfect square