Question

1.       Use a suitable identity to get the product of (7a-9b) (7a +9b). Write the identity also​

Answer 1

Answer:

(a+b)(a-b) = a^2 - b^2

Step-by-step explanation:

The identity applicable for this is (a+b)(a-b) = a^2 - b^2.

(7a-9b) (7a+9b)

7a^2 - 9b^2

Answer 2

Answer:

(7a-9b)(7a-9b)^2

using the identify (a-b)^2=a^2-2ab-b^2

(7a−9b)^2=(7a)^2−2×7a×9b+(9b)^2

(7a−9b)(7a−9b)=49a^2 −126ab+81b^2

Step-by-step explanation:

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