Subtract the following:
(1) $16 x^{3}$ from $15 x^{3} + 3 x^{2} - 25$
(2) $5 m^{2} + 3 m n + n^{2}$ from $m^{2} + 6 m n - 7 n^{2}$

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Solution

(1) $15 x^{3} + 3 x^{2} - 25 - 16 x^{3} =$ $- x^{3} + 3 x^{2} - 25$
(2) $m^{2} + 6 m n - 7 n^{2} - 5 m^{2} - 3 m n - n^{2} =$ $- 4 m^{2} + 3 m n - 8 n^{2}$

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