Question

use a suitable identity to get each of following products:(a+3b) (a+5b)​

Answer 1

Answer:

by using (x+a)(x+b) , we can get the answer of this question.

(a+3b)(a+5b)= (a)^2 + (3b+5b)*a+ (3b)(5b)

= a^2 + 8ab+ 15b^2

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Answer 2

Answer:

a^2 + 8ab + 15b

Step-by-step explanation:

algebraic identity IV = (x+a)(x+b) = x^2 + (A+b)x + ab

so using this let the x = a , a = 3b and b = 5b

 (a+3b) (a+5b)​ = (x+a)(x+b) = x^2 + (A+b)x + ab = (a)^2 + (3b+5b)(a) + (3b)(5b) .................................(substituting the values)

a^2 + (8b)a + 15b

a^2 + 8ab + 15b

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