Bonjour,
a)
(1 + 4x)² - (5x - 2) (1 + 4x) = 0
1 + 8x + 16x² - (5x + 20x² - 2 - 8x) = 0
1 + 8x + 16x² - 5x - 20x² + 2 + 8x = 0
16x² - 20x² + 8x + 8x - 5x + 1 + 2 = 0
- 4x² + 11x + 3 = 0
(- x + 3) (4x + 1) = 0
- x + 3 = 0 ou 4x + 1 = 0
- x = - 3 4x = - 1
x = 3 x = - 1/4
b)
(9x + 1)² = (x + 5)²
81x² + 18x + 1 = x² + 10x + 25
81x² - 10x² + 18 - 10x + 1 - 25 = 0
71x² + 8x - 24 = 0
c)
9 - 4x² - (5 - x) (3 - 2x) = 0
9 - 4x² - (15 - 10x - 3x + 2x²) = 0
9 - 4x² - 15 + 10x + 3x - 2x² = 0
- 4x² - 2x² + 10x + 3x + 9 - 15 = 0
- 6x² + 17x - 7 = 0
(- 2x + 1) (3x - 7) = 0
- 2x + 1 = 0 ou 3x - 7 = 0
- 2x = - 1 3x = 7
x = - 1/2 x = 7/3
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Bonjour,
a)
(1 + 4x)² - (5x - 2) (1 + 4x) = 0
1 + 8x + 16x² - (5x + 20x² - 2 - 8x) = 0
1 + 8x + 16x² - 5x - 20x² + 2 + 8x = 0
16x² - 20x² + 8x + 8x - 5x + 1 + 2 = 0
- 4x² + 11x + 3 = 0
(- x + 3) (4x + 1) = 0
- x + 3 = 0 ou 4x + 1 = 0
- x = - 3 4x = - 1
x = 3 x = - 1/4
b)
(9x + 1)² = (x + 5)²
81x² + 18x + 1 = x² + 10x + 25
81x² - 10x² + 18 - 10x + 1 - 25 = 0
71x² + 8x - 24 = 0
c)
9 - 4x² - (5 - x) (3 - 2x) = 0
9 - 4x² - (15 - 10x - 3x + 2x²) = 0
9 - 4x² - 15 + 10x + 3x - 2x² = 0
- 4x² - 2x² + 10x + 3x + 9 - 15 = 0
- 6x² + 17x - 7 = 0
(- 2x + 1) (3x - 7) = 0
- 2x + 1 = 0 ou 3x - 7 = 0
- 2x = - 1 3x = 7
x = - 1/2 x = 7/3