(4m^2 - 5)(4m^2 + 5)
You have to multiply each term from the parenthesis together, and add up the four terms. You may have heard of the expression FOIL (first, outer, inner, last)
16m^4 + 20m^2 - 20m^2 - 25
Now you can cancel out the middle two terms to arrive at your answer.
16m^4 - 25
Answer is A.
Let me know if you have any questions :)
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