Question

Expand (4x − 5)(4x + 5).


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Answer 1

Step-by-step explanation:

$(4x - 5)(4x + 5) \\ = 4x(4x + 5) - 5(4x + 5) \\ = 16 {x}^{2} + 20x - 20x - 25 \\ = 16 {x}^{2} - 25$