To factor x
2
+ 10x + 25 ,
use the formula a
2
+ 2ab + b
2
= (a + b)
2
,
noting that here, "a" is "x" and "b" is "5", to get
:
x
2
+ 10x + 25 = (x + 5)
2
.
No more factoring is possible.
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