How do you multiply #(1+3a)(1-3a)#?
The answer to this expression would be
For instance, in the example above (letter C), you start by multiplying
Later on, you multiply
Finally, you multiply
Now apply this new knowledge to the problem
Now combine like terms.
The answer is
Difference of squares
If you look at the 2 factors carefully you should recognise them as the factors to the difference of squares.
The objective of this question is to teach you that
Multiply everything in the right hand side (RHS) bracket by everything inside the left hand side (LHS) bracket.
Note that the + from