Add the given expression — task. Mathematics State Board, Class 7.

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87 x^{2} - 52 xy + 38 y^{2}

28 xy - 68 y^{2} + 38 x^{2}

and

y^{2} + xy - 68 x^{2}

\(=\) \(x^2\ -\) \(xy\) \(^2\)

(Note: Insert the suitable coefficient in the first two answer box and enter the coefficient of \(xy\) and the \(y^2\) with its sign.)

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7. Add the given expression