Multiply.
-$- 9 y \left( - 2 y ^ { 4 } \right)$
A) $9 y - 2 y ^ { 4 }$
B) $18 y ^ { 5 }$
C) $- 18 y ^ { 5 }$
D) $- 11 y ^ { 4 }$

Question

Quizplus · Accepted Answer

When multiplying two negative numbers, the result is positive. The multiplication of coefficients gives $9 \times 2 = 18$, and the multiplication of variables with exponents is done by adding the exponents: $y^1 \times y^4 = y^{1+4} = y^5$. Therefore, the correct answer is $18y^5$.

Multiply - −9y(−2y4)- 9 y \left( - 2 y ^ { 4 } \right)−9y(−2y4)

Multiply
- $- 9 y \left( - 2 y ^ { 4 } \right)$