Question

How did they get this answer? Algebra ll question

Answer 1

Answer:

Step-by-step explanation:

The action is similar to rationalization of denominator.

Multiply numerator and denominator by "i" [Memo: i = √(- 1) and (i)×(i)= - 1 ]

$\frac{(2+7i)i}{(-4i)i}$ = $\frac{2i+7i*i}{-4i*i}$ = $\frac{-7+2i}{4}$