Bonsoir,
x² - 14x + 49 = x² - 2 × 7 × x + 7² = (x - 7)²
x² + 12x + 36 = x² + 2 × x × 6 + 6² = (x+6)²
x² + 10x + 25 = (x + 5)²
9x² + 12x + 4 = (3x)² + 2 × 3 × 2 × x = (3x + 2)²
x² - 17x + 49 = (x-7)²
16x² + 9 - 24x = (4x - 3)²
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Bonsoir,
x² - 14x + 49 = x² - 2 × 7 × x + 7² = (x - 7)²
x² + 12x + 36 = x² + 2 × x × 6 + 6² = (x+6)²
x² + 10x + 25 = (x + 5)²
9x² + 12x + 4 = (3x)² + 2 × 3 × 2 × x = (3x + 2)²
x² - 17x + 49 = (x-7)²
16x² + 9 - 24x = (4x - 3)²