Question

It is the coefficient of ab in the product (5a + 3b)(b - 2a):
9. What is the
(1) 15
(2) - 2
(4) - 1
(3) – 11​

Answer 1

Answer:

The product would b as follows :

5a(b-2a)+3b(b-2a)=9

=5ab-10a²+3b²-6ab=9

=-10a²+3b²-1ab=9

=10a²+3b²-ab=9

So the coefficient of an in the given equation is -1

HOPE IT HELPS!!.!

Answer 2

Answer:

(4)

$- 1$

Step-by-step explanation:

$(5a + 3b)(b - 2a) = 9 \\ 5ab - 10 {a}^{2} + 3 {b}^{2} - 6ab = 9 \\ - 10 {a}^{2} + 3 {b }^{2} - ab = 9$

coefficient of ab is -1