Answer:
58
Step-by-step explanation:
The best thing to do here is to simplify those negative square roots. I see that you are in imaginary or complex numbers in math right now.
Simplifying the first negative radical, keeping in mind that i-squared = -1:
Simplifying the next negative radical:
Now we can rewrite those sets of parenthesis without the radicals!
(2 + 5i)(4 - 10i)
FOIL now:
2*4 = 8, then 2*(-10i) = -20i--> 8-20i
5i*4 = 20i, then 5i(-10i) = -50i^2
So altogether this is what we have:
You see that -20i and +20i cancel each other out, leaving us with just
Remember that -1 = i^2, so we can rewrite as:
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