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This is a special kind of expression called a difference of squares. Anything in the format a2 - b2 can be factored out as (a + b)(a - b). So we can say:

x2 - 25y2

= x2 - (5y)2

= (x + 5y)(x - 5y)

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Q: How do you factor x squared minus 25 y squared?
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