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9x^(2) + 16 DOES NOT factor.

Remember ; two squared terms with a plus(+) between them DOES NOT factor

However, two squared terms with a minus(-) between them DOES factor .

Hence 9x^(2) + 16 = (3x)^2) + 4^(2) does NOT factor

However, 9x^(2) - 16 = (3x)^2) - 4^(2) does factor to ( (3x - 4)(3x + 4)

Note the two different signs.

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lenpollock

Lvl 17
5d ago

What else can I help you with?