Given the function f(x) = -5|x + 1| + 3, for what values of x is f(x) = -12? x=-2, x=-4
x= -2, x = 4
x= 2, x= -4
X = 2, x = 4

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?