Find the product and write the result in standard form.
-$5 \mathrm { i } ( - 9 \mathrm { i } + 2 )$
A) $45 + 10 \mathrm { i }$
B) $- 45 + 10 \mathrm { i }$
C) $10 \mathrm { i } - 45 \mathrm { i } ^ { 2 }$
D) $10 \mathrm { i } + 45 \mathrm { i } ^ { 2 }$

Question

Quizplus · Accepted Answer

Multiplying $5i$ by each term in the parentheses gives $5i \cdot -9i + 5i \cdot 2$. Since $i^2 = -1$, the product becomes $-45(-1) + 10i$, which simplifies to $45 + 10i$.

Find the Product and Write the Result in Standard Form 5i(−9i+2)5 \mathrm { i } ( - 9 \mathrm { i } + 2 )5i(−9i+2)

Find the Product and Write the Result in Standard Form $5 \mathrm { i } ( - 9 \mathrm { i } + 2 )$