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Hello students this video covers algebraic expressions and identities class 8 ncert exercise 9.1, class 8 maths ncert chapter 9 exercise 9.1, this video covers the following questions (given on page no. 140)
Q1 :Identify the terms, their coefficients for each of the following expressions.
(i) 5xyz^2 - 3zy (ii) 1 + x + x^2 (iii) 4x^2 y^2 - 4x^2 y^2 z^2 + z^2 (iv) 3 - pq + qr - rp (v) x/2 + y/2 - xy (vi) 0.3a - 0.6ab + 0.5b (timing 01:04-10:39)
Q2 :Classify the following polynomials as monomials, binomials, trinomials. Which polynomials do not fit in any of these three categories?
x + y, 1000, x + x^2 + x^3 + x^4, 7 + y + 5x, 2y - 3y^2, 2y - 3y^2 + 4y^3, 5x - 4y + 3xy, 4z - 15z^2, ab + bc + cd + da, pqr, p^2 q + pq^2, 2p + 2q (timing 10:42-16:09)
Q3 :Add the following.
(i) ab - bc, bc - ca, ca - ab
(ii) a - b + ab, b - c + bc, c - a + ac
(iii) 2p^2 q^2 - 3pq + 4, 5 + 7pq - 3p^2 q^2
(iv) l^2 + m^2, m^2 + n^2, n^2 + l^2, 2lm + 2mn + 2nl (timing 16:10-37:53)
Q4 : (a) Subtract 4a - 7ab + 3b + 12 from 12a - 9ab + 5b - 3
(b) Subtract 3xy + 5yz - 7zx from 5xy - 2yz - 2zx + 10xyz
(c) Subtract 4p^2 q - 3pq + 5pq^2 - 8p + 7q - 10 from 18 - 3p - 11q + 5pq - 2pq62 + 5p^2 q (timing 37:55-54:53)

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