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Question
Factorize each of the following expression:
(x - 4y)2 − 625
Solution
\[(x - 4y )^2 - 625\]
\[ = (x - 4y )^2 - {25}^2 \]
\[ = [(x - 4y) - 25][(x - 4y) + 25]\]
\[ = (x - 4y - 25)(x - 4y + 25)\]
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