#### Simplify the following:

(i) 2x^{2} + 3y^{2} – 5xy + 5x^{2} – y^{2} + 6xy – 3x^{2}

(ii) 3xy^{2} – 5x^{2}y + 7xy – 8xy^{2} – 4xy + 6x^{2}y

(iii) 5x^{4} – 7x^{2} + 8x – 1 + 3x^{3} – 9x^{2} + 7 – 3x^{4} + 11x – 2 + 8x^{2}

**Solution:**

#### Subtract p – 2q + r from the sum of 10p – r and 5p + 2q.

**Solution:**

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