Bonjour,
(3x - 2)(x + 7) = 0
3x - 2 = 0 x + 7 = 0
3x = 2
x = 2/3 x = -7
(x + 4)² = 25
(x + 4)² - 25 = 0
x² + 2*4*x + 4² - 25 = 0
x² + 8x + 16 - 25 = 0
x² + 8x - 9 = 0
(x² + 9x) + (-x - 9) = 0
x(x + 9) - 1(x + 9) = 0
(x - 1)(x + 9) = 0
x - 1 = 0 x + 9 = 0
x = 1 x = -9
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Bonjour,
(3x - 2)(x + 7) = 0
3x - 2 = 0 x + 7 = 0
3x = 2
x = 2/3 x = -7
(x + 4)² = 25
(x + 4)² - 25 = 0
x² + 2*4*x + 4² - 25 = 0
x² + 8x + 16 - 25 = 0
x² + 8x - 9 = 0
(x² + 9x) + (-x - 9) = 0
x(x + 9) - 1(x + 9) = 0
(x - 1)(x + 9) = 0
x - 1 = 0 x + 9 = 0
x = 1 x = -9