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Kellypokofans
@Kellypokofans
April 2019
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A) Factorise 4x²-9
b) déduis-en une factorisation de l'expression :
J = 4x²-9+(2x+3)(x-1)
c) résous l'équation J = 0
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danielwenin
Verified answer
4x² - 9 = (2x+3)(2x-3)
4x²-9+(2x+3)(x-1) = (2x+3)(2x-3) + (2x+3)(x-1) = (2x+3)(2x-3+x-1) = (2x+3)(3x-4)
(2x+3)(3x-4) = 0 => 2x+ 3 = 0 => x = -3/2
=> 3x-4 = 0 => x = 4/3
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Verified answer
4x² - 9 = (2x+3)(2x-3)4x²-9+(2x+3)(x-1) = (2x+3)(2x-3) + (2x+3)(x-1) = (2x+3)(2x-3+x-1) = (2x+3)(3x-4)
(2x+3)(3x-4) = 0 => 2x+ 3 = 0 => x = -3/2
=> 3x-4 = 0 => x = 4/3