## MP Board Class 8th Maths Solutions Chapter 9 Algebraic Expressions and Identities Ex 9.1

Question 1.

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} + z2

(iv) 3 – pq + qr – rp

(v) \(\frac{x}{2}+\frac{y}{2}-x y\)

(vi) 0.3a – 0.6ab + 0.5b

Solution:

Question 2.

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, 9a^{2}, 2p + 2q

Solution:

Question 3.

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

Solution:

Question 4.

(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 – 2pq^{2} + 5p^{2}q

Solution: