Chapter 6 – Operations on Algebraic Expressions – R S Aggarwal Solutions for class 8
Algebraic Expression: In simple terms, an algebraic expression is any expression containing constants, variables and the operations like addition, subtraction, multiplication, etc.
For example: 5x-2, 4xy+5
Addition of algebraic expressions: First we collect like terms and then add them. We write the terms of the given expressions in the same order in form of rows with like terms below each other and adding column-wise.
Subtraction of algebraic expressions:
Step1: Arrange the terms of the given expressions in the same order.
Step2: write the given expressions in two rows in such a way that the like terms occur one below the other, keeping the expression to be subtracted in the second row.
Step3: Change the sign of each term in the lower row from + to – and from – to +.
Step4: with new signs of the terms of lower row, add column-wise.