Question

25m ^ 2 - 70mn + 49n ^ 2​

Answer 1

Step-by-step explanation:

let 5m=a

7n=b

⟹a

2

−2ab+b

2

(a−b)

2

(5m−7n)

2

Answer 2

Step-by-step explanation:

25m^2 - 70mn +49n^2

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

= (5m)^2 -( 7n)^2

= (5m-7n)^2