Algebra 2! 1: for the function f(x)=(1-4x)^2, find f^-1. determine whether f^-1 is a function. a: f^-1(x)= -(1(+/-) sqrt x)/4; is a function b: f^-1(x)= (1(+/-) sqrt x)/4; is not a function c: f^-1(x)= (1(+/-) sqrt x)/4; is a function d: f^-1(x)= -(1(+/-) sqrt x)/4; is not a function