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=> 16p²+20p+20p+25
=> 16p²+40p+25
2. (6a+b)² = (6a+b)(6a+b)
=> 36a²+6ab+6ab+b²
=> 36a²+12ab+b²
3. (10m-3n)² = (10m-3n)(10m-3n)
=> 100m-30mn-30mn+9n²
=> 100m-60mn+9n²