Multiplication of Polynomials - Grade 8 (Question: 1612248465)
If the length and width of a rectangle are \((-3a^2 - 4a + 9)\) and \((-7a^2 - 5a -6)\), find the area of the rectangle.
A. \(21a^4 + 43a^3 -25a^2 + 21a + 54\)
B. \(21a^4 + 43a^3 - 25a^2 - 21a - 54\)
C. \(21a^4 - 43a^3 - 25a^2 + 21a - 54\)
D. \(21a^4 + 43a^3 + 25a^2 + 21a + 54\)