Polynomial expressions Q!!! ASAP please!!!! the expression x^4+2x^3+ax^2+bx+c is divisible by x^2+x-2.?

the expression x^4+2x^3+ax^2+bx+c is divisible by x^2+x-2. when it is divided by x+1 the remainder is -8. find the values for a,b & c.