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EmmaDSY
@EmmaDSY
May 2022
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Bonsoir, j’aurais besoin d’aide pour les exercices 8 et 9. Pour demain premier cours. Merci d’avance ;)
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AnasAg
Explications étape par étape:8) T= x² + 8x +16 = x² + 2×x×4 + 4² = (x+4)² U= y² +2y +1 = y² + 2×y×1 + 1² = (y+1)² V= x² -14x +49 = x² - 2×x×7 + 7² = (x-7)²W= x² -16x +64 = x² - 2×x×8 + 8² = (x-8)²X= 4x² - 49 = (2x)² - 7² = (2x -7)(2x +7)Y= 100 -9y² = 10² - (3y)² = (10 - 3y)(10 + 3y) Z= (2x +1)² - 64 = (2x +1)² - 8² = (2x +1 -8)(2x +1 +8) = (2x -7)(2x +9)9) 1) A= (4x -3)² - (3x +1)(4x -3) = [(4x)² - 2×4x×3 + 3²] - [3x×4x - 3x×3 + 1×4x - 1×3] = (16x² -24x +9) - (12x² - 9x + 4x - 3) = (16x² -24x +9) - (12x² -5x -3) = 16x² -24x +9 -12x² +5x +3 = 16x² -12x² -24x +5x +9 +3 = 4x² -19x +12 2) A= (4x -3)² - (3x +1)(4x -3) = (4x -3) [(4x -3) - (3x +1)] = (4x -3) (4x -3 -3x -1) = (4x -3)(x -4)3) A= (4x -3)² - (3x +1)(4x -3) = (4×0 -3)² - (3×0 +1)(4×0 -3) = (0-3)² - (0+1)(0-3) = (-3)² - 1 × (-3) = 9 +3 = 124) A= (4x -3)² - (3x +1)(4x -3) = (4×4 -3)² - (3×4 +1)(4×4 -3) = (16 -3)² - (12+1)(16-3) = 13² - (13×13) = 169 - 169 = 0
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EmmaDSY
Merci beaucoup, vous me sauvez ! Bonne nuit !
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