Question 1125187
a. 8x(x+9) = (8x * x) + (8x * 9) = 8x^2 + 72x


b. 7y(3x-2y) = (7y*3x) - (7y*2y) = 21xy - 14y^2



c. a(a^2b+b^3c) = (a*a^2b) + (a*b^3c) = a^3b + ab^3c