The result in scientific notation is 2 x 10³.
Given,
(5 × 10^-3) (4 × 10^5)
We need to write in scientific notation.
What is scientific notation?
When a large number is written between 1 and 10 with a power of 10.
Multiply (5 × 10^-3) (4 × 10^5).
= (5 x 1/10^3)x (4 x 100000)
= 5 / 1000 x 4 x 100000
= 20 x 100
= 2 x 1000
= 2 x 10³
2 is a number between 1 and 10 and 10^3 is a power of 10.
Thus the result in scientific notation is 2 x 10³.
Learn more about writing numbers in scientific notation here:
https://brainly.com/question/166261
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