Brainlag PlusThe vocabulary of algebra, the identity sign, finding unknowns in an identity, and simplifying algebraic fractions.
Four words
- An expression has no equals sign: 3x + 5.
- An equation is true for particular values: 3x + 5 = 20 only when x = 5.
- A formula links quantities: A = lw.
- An identity is true for every value, written with ≡: 2(x + 3) ≡ 2x + 6.
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 3, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards