Question

1 Chap car the multiplication of the expressions in each of the following pairs
(iii) a + b, 7ab2
EXERCISE 9.3
(11) ab, a-b
(iv) a²-9, 40
(6 4p, qtr
W pq +91 + rp, 0​

Answer 1

$(a + b)(7a {b}^{2} ) \\ = a(7a {b}^{2} ) + b(7a {b}^{2} ) \\ = 7 {a}^{2} {b}^{2} + 7a {b}^{3}$

$(ab)(a - b) \\ = ab(a) - ab(b) \\ = {a}^{2} b - a {b}^{2}$

$( {a}^{2} - 9)(40) \\ = 40 {a}^{2} - 360$

$(4p)(qtr) \\ = 4pqrt$

$(wpq + pq + 91 + rp)(0) \\ = 0$