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1. Difficulty : Level 5*
2. Difficulty : Level 3

Simplify (8 – 3x)(5x + 7) + (3x + 1)(2x + 3) and express the answer in descending powers of x.

3. Difficulty : Level 3

Factorize x2 – 16.

4. Difficulty : Level 3Simplify (7 – 6x)( –5x + 2) – (4x – 1)(2x – 3) and express the answer in descending powers of x.

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