SOLUTION: factor out completely {{{ 16x^2 - 25 }}}

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Question 418622: factor out completely
+16x%5E2+-+25+

Answer by algebrahouse.com(1659) About Me  (Show Source):
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16x^2 - 25

It is a difference of two squares, in the form a^2 - b^2
- it factors into the form (a + b)(a - b)

If a^2 = 16x^2.....a = 4x {took square root}
If b^2 = 25........b = 5 {took square root}

16x^2 - 25
= (4x + 5)(4x - 5)
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