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A² - B² ≠ (A+B)²
A² - B² = (A-B)(A+B)
a. p² + 2pq + q² = (p + q)(p+q) = (p+q)²
b. x² - 4x + 4 = (x-2)(x-2) = (x-2)²
B. (X-2) (x-2) / (x-2) pangkat 2