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Find factors of 16 which add to 8:

Factors of 16 are 1 & 16, 2 & 7 and 4 & 4:

Only the last add to 8 so: (x + 4)(x + 4) or (x + 4)2

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12y ago
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Q: How do you factor x2 plus 8x plus 16?
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