Another One, twenty points, you will be reported if you answer incorrectly.

Step-by-step answer:First, we need to understand the rule of exponents.When powers of a particular variable are multiplied, the exponents add.For example, x^3*x^4 = x^(3+4) = x^7 ......................(1)When there is a division, the exponents subtract.For example, y^5/y^3 = y^(5-3) = y^2   ....................(2)Also, the distributive property saysp*(q+r+s) = pq + pr + ps  ......................(3)Using the above basic rules, we have-a^2b^2c^2*( a + b - c )...................... use (3) to distribute= -a^2b^2c^2*a -a^2b^2c^2*b + a^2b^2c^2*c..................use (1) to multiply= -a^3b^2c^2 -a^2b^3c^2 + a^2b^2c^3