Answer
This equation is false.
Work Step by Step
Step 1: Write Left Hand Side of the equation.
$-m(n-m)$
Step 2: Use Distributive law.
$-m(n)+(-m)(-m)$
Step 3: Since the product of a negative number and a positive number is negative. And the product of two negative numbers is positive.
We get, $-mn+m^2$
Step 4: Now write Right Hand Side of the equation.
$-(mn+m^2)$
Step 5: Use Distributive law.
We get, $-mn-m^2$
Since the Left Hand Side and the Right Hand Side are not equal.
This equation is false.
