You should be able to
addition and subtraction of linear expressions
Success Criteria:
I am able to
identify like terms to add and subtract algebraic expression
Pre-Requisite:
multiplication rule for integers
know what are like terms and unlike terms
Combined operation rule
Always look through all examples in textbook before lesson.
Adding and subtracting terms: Combine or simplify terms
When you have a few like terms in an expression, you cannot leave it as that. You will need to simplify it by combining all like terms together.
Eg: 3x + x : We dont leave the answer as this, since they are like terms, we have to combine them. Hence 3x + x = 4x
When multiplying by negative:
Eg: -2(a+b) = -2a - 2b Notice the signs in the bracket are both positive but after multiplying with the negative, the answer are both negative. In a way, the sign have changed to the opposite sign.
Eg: 2(a+b) = 2a + 2b Notice the signs in the bracket are both positive, when the sign outside the bracket is positive, there will be no change to the sign. Hence the answer is still both positive.
Note:
p x p x p not = p3. p3 means p x 3
p x p x p = p^3
Use the little symbol ^ to represent power.