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Sagot :
A. 4x + 9 = 34
- 9 - 9
4x = 25
4 4
x = 6.25
B. (x - 4)(x + 2) = 0
x - 4 = 0 U x + 2 = 0
+ 4 + 4 - 2 - 2
x = 4 x = -2
C. 2x² - 6x + 4 = 0
2(x²) - 2(3x) + 2(2) = 0
2(x² - 3x + 2) = 0
2 2
x² - 3x + 2 = 0
x = -(-3) +/- √((-3)² - 4(1)(2))
2(1)
x = 3 +/- √(9 - 8)
2
x = 3 +/- √(1)
2
x = 3 +/- 1
2
x = 3 + 1 U x = 3 - 1
2 2
x = 4 x = 2
2 2
x = 2 x = 1
- 9 - 9
4x = 25
4 4
x = 6.25
B. (x - 4)(x + 2) = 0
x - 4 = 0 U x + 2 = 0
+ 4 + 4 - 2 - 2
x = 4 x = -2
C. 2x² - 6x + 4 = 0
2(x²) - 2(3x) + 2(2) = 0
2(x² - 3x + 2) = 0
2 2
x² - 3x + 2 = 0
x = -(-3) +/- √((-3)² - 4(1)(2))
2(1)
x = 3 +/- √(9 - 8)
2
x = 3 +/- √(1)
2
x = 3 +/- 1
2
x = 3 + 1 U x = 3 - 1
2 2
x = 4 x = 2
2 2
x = 2 x = 1
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