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9k^{2}-25n^{2}
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9k^{2}-25n^{2}
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9k^{2}-k+k-25n^{2}
Use the distributive property to multiply k by 9k-1.
9k^{2}-25n^{2}
Combine -k and k to get 0.
9k^{2}-k+k-25n^{2}
Use the distributive property to multiply k by 9k-1.
9k^{2}-25n^{2}
Combine -k and k to get 0.
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