CBSE class 8 mathematics maths Algebraic Expressions and Identities, access study material for Mathematics maths Algebraic Expressions and Identities, students can free download in pdf, practice to get better marks in examinations. all study material has been prepared based on latest guidelines, term examination pattern and blueprint issued by cbse and ncert
click on tabs below for class 8 mathematics maths Algebraic Expressions and Identities worksheets, assignments, syllabus, ncert cbse books, ncert solutions, hots, multiple choice questions (mcqs), easy to learn concepts and study notes of class 8 mathematics maths Algebraic Expressions and Identities chapter, online tests, value based questions (vbqs), sample papers and last year solved question papers
1. Expressions are formed from variables and constants.
2. Terms are added to form expressions. Terms themselves are formed as product of factors.
3. Expressions that contain exactly one, two and three terms are called monomials, binomials and trinomials respectively. In general, any expression containing one or more terms with non-zero coefficients (and with variables having non- negative exponents) is called a polynomial.
4. Like terms are formed from the same variables and the powers of these variables are the same, too. Coefficients of like terms need not be the same.
5. While adding (or subtracting) polynomials, first look for like terms and add (or subtract) them; then handle the unlike terms.
6. There are number of situations in which we need to multiply algebraic expressions: for example, in finding area of a rectangle, the sides of which are given as expressions.
7. A monomial multiplied by a monomial always gives a monomial.
8. While multiplying a polynomial by a monomial, we multiply every term in the polynomial by the monomial.
9. In carrying out the multiplication of a polynomial by a binomial (or trinomial), we multiply term by term, i.e., every term of the polynomial is multiplied by every term in the binomial (or trinomial). Note that in such multiplication, we may get terms in the product which are like and have to be combined.
10. An identity is an equality, which is true for all values of the variables in the equality. On the other hand, an equation is true only for certain values of its variables. An equation is not an identity.
11. The following are the standard identities:
(a + b) 2 = a2 + 2ab + b2 (I)
(a – b) 2 = a2 – 2ab + b2 (II)
(a + b) (a – b) = a2 – b2 (III)
12. Another useful identity is (x + a) (x + b) = x2 + (a + b) x + ab (IV)
13. The above four identities are useful in carrying out squares and products of algebraic expressions. They also allow easy alternative methods to calculate products of numbers and so on.
Latest CBSE News
- Human Resource Development Ministry will soon post on its website the details regarding reduction of NCERT syllabus and ask for suggestions from teachers, parents, educational experts, students and any other concerned person. Everybody will be given time for more than month to post their suggestions and comments on the syllabus reduction by NCERT. The suggestions will be then reviewed by the...
- There has been news going around that paper has been leaked. This news came to light when Delhi Education Minister tweeted about the images which he got on his whatsapp. He verified the images with the actual accountancy paper and to the shock of everyone the paper matched Set 2 of the accountancy paper. Sisodia immediately got in touch with CBSE to file a complaint. CBSE has come forward and...
- The admission process for Kendriya Vidyalayas class 1 students are going to start from today and the process will continue till March 18. The admissions for class 2 till class 12 will start in April. The students will get admissions to class 2 of the KV school they want to get admission only on availability of seats in that school. Similarly, the admission in class 11 will depend on the board...
- The sale of Non NCERT books and school uniforms by private vendors have been again allowed in school premises by the Delhi High Court. CBSE had earlier passed a circular instructing all schools to close down tuck shops in schools which sell Non NCERT books and uniforms in school premises as it leads to commercialisation of the school as there were lot of complaints that the profits are pocketed...
- Raksha Gopal from Noida scored 99.6% marks in class 12th last year. There are some very useful tips which she has given for students appearing in the class 12 board exams this year. See her tips below: a) Stop worrying about the marks that you have to target. Concentrate more on making a schedule which can help you to cover the entire syllabus with enough time to practice as many test papers as...