what is the answer?

Answer:
when multiplying polynomials you want to times the coefficients but add the exponents
(-7a^4b^1c^3)(5a^1b^4c^2) (if there isn't an exponent then it is 1)
-7*5=-35
a^4*a^1=a^5
b^1*b^4=b^5
c^3*c^2=c^5
Your answer would be
-35a^5b^5c^5
Hope this helps ;)