Question

Use a suitable identity to get each of the following products. (7a-9b)(7a-9b)​

Answer 1

Answer:

Step-by-step explanation:

(7a-9b) \times (7a-9b) = (7a-9b)^{2}

We use identity II for this which is  

                                                     (a-b)^{2} =a^{2}-2ab + b^{2}

In this a = 7a and b = 9b  

                                       (7a-9b)^{2} =(7a)^{2}-2(7a)(9b) + (9b)^{2}

                                                               =  49a^{2}-126ab + 81b^{2}

Please mark it as Brainliest answer

Thanks