Question 1155341
f(x)=ax^3+bx^2+cx+d


f(1)=>   a+b+c+d =5

F(2)=> 8a +4b+2c+d =7

f(-1)=> =-a +b -c +d = 1

f(-3)=>  -27a +9b -3c +d =-83

use calc
to get a=-2.5,b=-3,c=-2.5,d=4

plug valuea to get function