Question
4x* + 25 = -20x
x* = 8
Equation produit
x* = 8
Equation produit
Asked by: USER5482
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Answer (51)
4x²+20x+25 = 0 = a²+2ab+b² = (a+b)² = 0
(2x+5)² = 0
2x+5 = 0
2x = -5
x = -5/2
x² = 8
x= -2V2
x =2V2
(2x+5)² = 0
2x+5 = 0
2x = -5
x = -5/2
x² = 8
x= -2V2
x =2V2
Bonjour
4x²+25 = 20x revient à
4x² + 20x + 25 = 0
(2x + 5)² = 0
2x+5 = 0
x = -5/2
x² = 8
x² - 8 = 0 forme de a² - b² = (a-b)(a+b)
(x - √8)(x+√8) = 0
deux solutions soit
x = √8 = 2√2
soit
x = -√8 = -2√2
Bonne journée
4x²+25 = 20x revient à
4x² + 20x + 25 = 0
(2x + 5)² = 0
2x+5 = 0
x = -5/2
x² = 8
x² - 8 = 0 forme de a² - b² = (a-b)(a+b)
(x - √8)(x+√8) = 0
deux solutions soit
x = √8 = 2√2
soit
x = -√8 = -2√2
Bonne journée