upper bound for quadratic form in terms of vector norm and eigenvalues

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I have a quadratic form. if Q, P and M are positive and symmetric matrices.

$$(-x^T Q x - 2 x^T Q e - e^T Q e) + (y^T M y + 2 x^T P y + 2 e^T P y )$$

how can I get an upper bound for this quadratic form in terms of vector norm and eigenvalues?