How do you multiply #(2a+3b)^2#?
Expand out the square so it's easier to see, then use the distributive property to arrive at
Let's first expand this out so that it's easier to see and work with:
Now we use the distributive property which says that each term in the first bracket multiplies against each term in the second bracket, like this:
And now we add them all up
We can combine the 2