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2.a. (a+b)² = (a+b)(a+b) = a²+2ab+b²
b. (a-b)² = (a-b)(a-b) = a²+ (-2ab) + b²
c. (ax+b) x (cx+d) = acx² + adx + bcx + bd
3. a²-b² = (a+b)(a-b)
40 = (a+b) x 4
a+b =
a+b = 10