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Find the sum of: 4x^{2}+ 8xy – 2y^{2} and 8xy – 5y^{2} + x^{2}

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#### Solution

4x^{2}+ 8xy – 2y^{2} and 8xy – 5y^{2} + x^{2}

4x^{2}+ 8xy – 2y^{2} + 8xy – 5y^{2} + x^{2}

= 4x^{2} + x^{2} + 8xy + 8xy - 2y^{2} - 5y^{2}

= 5x^{2} + 16xy - 7y^{2}

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