The answer is 16[tex]c^{2][/tex] - [tex]9d^{2} [/tex], or A.
We can solve this problem by easily by factoring. Right off the bat, we can see that this is the difference of 2 squares. The difference of two square's factored form is (a+b)(a-b), which is what this equation is in right now. But, if we want the unfactored form, then we need to do [tex]a^{2} - b^{2} [/tex], with a being -4c and b being 3d. -4c squares. Simplifying those values, we get 16[tex]c^{2][/tex] - [tex]9d^{2} [/tex], which is the same as A.
