Effects of Production on the Environment
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Group terms strategically: \((a^2 - 4a + 4) - b^2\). The first group is a perfect square: \(a^2 - 4a + 4 = (a - 2)^2\). So we have \((a - 2)^2 - b^2\), which is a difference of squares: \([(a - 2) - b][(a - 2) + b] = (a - 2 - b)(a - 2 + b)\).
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