Expressions, Equations, Formulae & Identities | Algebra | Maths | FuseSchool

Expressions, Equations, Formulae & Identities | Algebra | Maths | FuseSchool

Expressions, equations, formulae and identities are all slightly different types of algebraic notation. In this video we’re going to discover the differences. An expression is a collection of letters and numbers, with no equals sign. An equation is two expressions that equal each other, and so can be solved. A formula is a special type of equation. It shows the relationship between different variables, like the area of a circle and the radius. A formula needs more than 1 variable - otherwise it is just an equation. An identity is another special type of equation. They are equations that are true no matter what values are chosen. The two sides of an identity are interchangeable, so we can replace one with the other at any time. Strictly speaking, for identities we should use the three bar sign which means “equivalent to”. But it is common to just see the normal equals sign.

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[Filipsnewns]

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[nehmatgill]

Thank you so much!
I have a summative this friday
Hope I get a A!

[matthewkenslow]

This has been a remarkable, outstanding video. Thank you! It is very clear to understand.

I deeply apologize for this over-complicated question: an expression is an amalgamation of numbers and letters such as 4x or 2a+5b; an equation is two expressions equal to each other, like 5x-43=32x+8. This is essentially what you said in the video and description. Now, here is my only quandary: consider the equation, 4x+8=4. Now, is this just one expression equal to a number or constant? Is 8 an expression even though there isn't a variable? If so, then this equation is just one expression equal to a constant; therefore, if I am understanding this correctly, an equation is really at LEAST ONE expression equal to something...anything?

Sorry for any confusion. I am probably the only person in the world who would ever even think of it.
Have a great day.
:D

[宋夏萍]

Very clear explanation, Thanks a lot!

[zenscelestial]

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[hazemalawawdeh]

Thanks for ur help now I get the differences

[lurkzy]

Thank U So Much!
I Have A Exam Tommrow...
Hope I pass💯

[khaledmusallam]

too nice thank you it gave a lot of ideas