5(x²-8)=x-(3+x)(4-5x)
Mathématiques
karine06
Question
5(x²-8)=x-(3+x)(4-5x)
2 Réponse
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1. Réponse nathalienouts
5(x²-8) = x-(3+x)(4-5x)
5x²-40 = x - (12-15x+4x-5x²)
5x²-40 = x-12+11x+5x²
-40 = 12x-12
12x = -40+12
12x = -28
x = -28/12
x = -7/3 -
2. Réponse Anonyme
5(x²-8)=x-(3+x)(4-5x)
5x²-40 = x-(12-15x+4x-5x²
5x²-40 = x-12+11x+5x²
5x²-12x-5x² = 40-12
-12x = 28
x =-28/12
= -7/3