Simplify (1-2z)(1+2z)i've already done the math and gotten - 4z^2+1 (which is correct when i check) but it's not in my list for the multiple choice question i'm on. the answers i have are the following: a) 1 - 4zb) 1 - 4z - 4z^2c) 4z^2 - 4z - 1d) 4z^2 - 1if someone could tell me which answer would be correct in this situation, that would be amazing. you to anyone who takes the time to figure this out!