FACTOR

x^2 + 4

x^2 - 9x +16

x^2 + 6xy - 7y^2

x^4 - 81

x^4 +16y^2

(x+3)^2 - y^2

Thank youuu

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FACTOR

x^2 + 4

x^2 - 9x +16

x^2 + 6xy - 7y^2

x^4 - 81

x^4 +16y^2

(x+3)^2 - y^2

Thank youuu

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## Answers (1)

x^2 + 4 doesn't factor in real numbers.

x^2 - 9x +16 doesn't factor in rational numbers.

x^2 + 6xy - 7y^2 = (x - y) (x + 7y)

x^4 - 81 = (x^2 + 9) (x^2 - 9) = (x^2 + 9) (x + 3) (x - 3)

x^4 +16y^2 doesn't factor in real numbers.

(x+3)^2 - y^2 = (x + 3 + y) (x + 3 - y)