Answer
16$x^{4}$ - 25$y^{2}$
Work Step by Step
1. Product of the sum and difference of two terms:
(4$x^{2}$ - 5y)(4$x^{2}$ + 5y) = $(4x^{2})^{2}$ - $(5y)^{2}$
2. Solve exponents with power rules
16$x^{4}$ - 25$y^{2}$
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