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a) 4a² + 20a + k ----> k = 25 (2a + 5)² = 2a² + 20a + 25
c) x² + 5xy + ky² ------> k = 6,25 (x + 2,5y)² = x² + 5xy + 6,25y²
(a - b)² = a² - 2ab + b²
b) b² - 8ab + ka² ------> k = 16 (b - 4a)² = b² - 8ab + 16a²