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a)6x(-1)la puterea n-2x(-1)la puterea n+1 , n∈N
b)4(3x-7)-5(2x+7)=7(2x+3)-3(3x-1)

Răspuns :

Renatemambouko
b)4(3x-7)-5(2x+7)=7(2x+3)-3(3x-1)
12x-28-10x-35=14x+21-9x+3
12x-28-10x-35=14x+21-9x+3
3x=-87
x=-87/3
x=-29


A)  6x(-1)^n-2x(-1)^(n+1)=
=2x(-1)^n[3x(-1)⁰-(-1)¹]=
=2x(-1)^n(3x1+1)=
=2x(-1)^nx4=
=8x(-1)^n
n=nr pare
A=8x(-1)^n=8

n=nr impare
A=8x(-1)^n=-8



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