Question

(3a-7b)² Expand it using standard formula PLEASE NEED IT​

Answer 1

Answer:

9a^2-42ab+49b^2

Step-by-step explanation:

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

Answer 2

Answer:

(a- b)²= a² + b²- 2ab

So (3a - 7b)²= (3a)² + (7b)²- 2(3a) (7b) = 9a² + 49b²- 42ab