Question 891710
Multiply and simplify: (5 − 2i)(4 + 7i). 
Write the answer in the form a + bi, where a and b are real numbers.



I used FOIL and got the answer: (-14i^2)+27i+20
but every online calculator is telling me the answer is 34+27i
What is the correct answer?
<pre>
{{{i^2 = -1 }}}, so substituting - 1 for {{{i^2}}} in {{{(- 14i^2) + 27i + 20}}} results in {{{- 14(- 1) + 27i + 20}}}, or 
14 + 27i + 20, which simplifies to: {{{highlight_green(34 + 27i)}}}, the same answer you've been getting.