Question

use suitable Identity and find the product (3a-7)(3a-7)
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Answer 1

Answer:

9a^2-42a+49

Step-by-step explanation:

It will be (a-b)^2

Hence it will be a^2-2ab+b^2

9a^2-42a+49

Answer 2

Answer:

(a-b) (a-b) = (a-b)²= a²+b²-2ab

(3a-7) (3a-7) = (3a-b)²= (3a)² + (-7)² -2 x 3a x (-7)

9a²+ 49 + 14 x 3a = 9a² + 49 + 42a

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