Question

Using suitable identities , find the following products :-

(ii) (9y - 5) (9y - 5)​

Answer 1

81y²-90xy+25

Step-by-step explanation:

$(9y - 5)(9y - 5)$

Using Identity, (a-b) (a-b) = a²-2ab+b²

Where,

• a = 9y
• b = 5

$(9y - 5)(9y - 5) \\ ( {9y}^{2} ) - 2(9y)(5) + ( {5}^{2} ) \\ = > 81 {y}^{2} - 90xy + 25$