Question

25m square-40mn+16n square​

Answer 1

Answer:

Step-by-step explanation:

$25m^{2}-40mn+16n^{2}\\= (5m)^{2}-2*55m*4n + (4n)^{2}\\= (5m-4n)^{2}$

∵

$(a-b)^{2}=a^{2}-2*a*b+b^{2}$

Answer 2

Answer:$2^2x^{2} x^{2} x^{2} x^{2} x_{123} \neq \frac{x}{y}$

Step-by-step explanation: