Question

What is the product of the complex numbers below? (4 - 21)(1 + 7) O A. 18 - 307 - OB B. -10 - 301 O C. -10 + 261 + O + D. 18 + 261

Answer 1

Given:

$(4-2i)(1+7i)$

To find: The product of two complex numbers:

Explanation:

On expansion we get,

$(4-2i)(1+7i)=4+28i-2i-14(i^2)$

As we know,

$i^2=-1$

So, we w