Question

Qual é o conjunto verdade da seguinte equação : x/2 + x/3 = ( 7 + 2 x )/3 

a)x = 14

b)x = -13

c)x = 13

d)x = - 14

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Answer 1

VER A RESPOSTA

RESPONDER

(x+5)•(-2x+6)•(5x-7) > 0

↓

{(x+5)•(-2x+6) > 0

{5x -7 > 0

{(x+5)•(-2x+6) < 0

{5x-7 < 0

↓

{x ∈ ⟨-5,3⟩

{x > 7/5

{x ∈ ⟨-∞,-5⟩ ∪ ⟨3,+∞⟩

{x < 7/5

↓

x ∈ ⟨7/5 ,3⟩

{x ∈ ⟨-∞,-5⟩ ∪ ⟨3,+∞⟩

{x < 7/5

↓

x ∈ ⟨7/5 ,3⟩

x ∈ ⟨-∞,-5⟩

↓

x ∈ ⟨-∞,-5⟩ ∪ ⟨7/5 ,3⟩