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2a.)) a²+2b+b²
2b.)) a²-2a²+b²
2c.)) acx² + adx + bcx + db
2. a. (a+b)² = (a+b)(a+b) = a²+ab+ab+b² = a²+2ab+b²
b. (a-b)² = (a-b)(a-b) = a²-ab-ab+b² = a²-2ab+b²
c. (ax+b)(cx+d) = acx²+adx+bcx+bd