Question

using the suitable identity evaluate the following
(a+b) (b-5)​

Answer 1

Answer:

the answer of the question is

Step-by-step explanation:

b²(a-5)

Answer 2

Step-by-step explanation:

(a+b)(b-5)

it can be written as

(b+a)(b-5)

using id (x+a)(x+b)= x2+(ab)x+x(a+b)

(b)2+(a(-5))b+b(a+(-5))

b2+(-5a)b+b(a-5)

b2+(-5ab)+ab-5b

b2-5ab+ab-5b

b2-4ab-5b