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factor the expression. k^2 – 9h^2 a. h^2(k 3)(k – 3) b. (k – 3h^2)(k 3) c. (k 3h)(k 3h) d. (k 3h)(k – 3h)
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factor the expression. k^2 – 9h^2 a. h^2(k 3)(k – 3) b. (k – 3h^2)(k 3) c. (k 3h)(k 3h) d. (k 3h)(k – 3h)

User Luator
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Use\ a^2-b^2=(a-b)(a+b)\\\\k^2-9h^2=k^2-3^2h^2=k^2-(3h)^2=(k-3h)(k+3h)
User Benjamin Barrois
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