Given that, (x+3y)2+2(x+3y)(x-y)+(x-y)2.
Clearly this is in the form of (a+b)2=a2+2ab+(b)2.
Here a = x+3y and b = x-y
Substitute these values in the formula, we get,
Directions: Solve the following problems. Also write at least 10 examples of your own.