what is the constant term of the following.

1). f(x)=4-3x²+5x+x⁴
2). P(x)=5-3x+5x²+2x³
3). f(x)=4x²-3+3x³
4). y=x⁵-3x⁸+5x³+1
5). y=3x⁵-x+x²-5

PLEASE ANSWER PROPERLY :(
NONSENSE ANSWER = REPORT.​