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lulu111
@lulu111
January 2021
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Bonjour, je ne réussit pas à faire cet exercice. Aidé moi s'il vous plaît.
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nonotata
Bonsoir
x= 0.5 = 1/2
donc
4(1/2)² +8(1/2) -5 = 4(1/4) +8/2 -5 = 4/4 +4-5 = 1+4-5 = 5-5 =0
(2x+2)²- 9
4x²-8x+4-9
4x²-8x-5
(2x+2)²-9
(2x+2)²-3²
(2x+2-3)(2x+2+3)
(2x-1)(2x+5)
3/
(2x-1)(2x+5) =0
2x-1=0 2x+5 =0
2x =1 2x = -5
x = 1/2 x = -5/2
b)
pour x = 1/2 et x = -5/2 E = 0
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Lista de comentários
x= 0.5 = 1/2
donc
4(1/2)² +8(1/2) -5 = 4(1/4) +8/2 -5 = 4/4 +4-5 = 1+4-5 = 5-5 =0
(2x+2)²- 9
4x²-8x+4-9
4x²-8x-5
(2x+2)²-9
(2x+2)²-3²
(2x+2-3)(2x+2+3)
(2x-1)(2x+5)
3/
(2x-1)(2x+5) =0
2x-1=0 2x+5 =0
2x =1 2x = -5
x = 1/2 x = -5/2
b)
pour x = 1/2 et x = -5/2 E = 0