Multiply the binomials: (2c - d) (3c + d)

6c^2-cd-d^2

Step-by-step explanation:

How you get the answer is you use the process called FOIL. The F is front, so you multiply the 2c and the 3c to get 6c^2. The O is the outer, so you multiply the 2c and the d (because they are on the outer sides of the parenthesis) to get 2cd. The I is the inner, so you multiply the - d and the 3c (because they are on the inner sides of the parenthesis) to get - 3cd. The L is the last, so you multiply d and - d to get - d^2. The 2cd and the - 3cd are the same so you have to minus them to get - cd. So the answer is:

6c^2-cd-d^2.