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Question
Simplify.
(x2 − 5) (x + 5) + 25
Sum
Solution
(x2 − 5) (x + 5) + 25
= x2 (x + 5) − 5 (x + 5) + 25
= x3 + 5x2 − 5x − 25 + 25
= x3 + 5x2 − 5x
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