NCERT Solutions For Class 8 Maths Chapter 9,Algebraic Expressions And Identities, Exercise 9.4

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Class 8, Maths, Chapter 9, Exercise 9.4, Solutions

Q.1. Multiply the binomials.

(i) (2x+5) and (4x–3)

(ii) (y – 8) and (3y – 4)

(iii) (2.5l –0.5m) and (2.5l+0.5m)

(iv) (a+3b) and (x+5)

(v) (2pq+3q²) and (3pq – 2q²)

(vi) $\left( \frac{3}{4}{{a}^{2}}+3{{b}^{2}} \right)\,\,and\,\,\left( {{a}^{2}}-\frac{2}{3}{{b}^{2}} \right)\,$

Q.2. Find the product.

(i) (5 –2x) (3+x)

(ii) (x+7y) (7x – y)

(iii) (a²+b) (a+b²)

(iv) (p²–q²) (2p+q)

Q.3. Simplify.

(i) (x²– 5) (x + 5) + 25

(ii) (a² + 5) (b³+3) + 5

(iii) (t +s²) (t²– s)

(iv) (a+b) (c–d) + (a–b) (c+d) + 2(ac+bd)

(v) (x+y)(2x+y) + (x+2y)(x –y)

(vi) (x+y)(x²–xy+y²)

(vii) (1.5x – 4y) (1.5x + 4y + 3) – 4.5x + 12y

(viii) (a + b + c) (a + b– c)