Pergunta

Which of the following equations has no real solutions? A. 3x-3=3x-3 B 3(x+3)=3(x+13) C 3(x-3)=3x-9 D. 3x-3=9x-3
Solução

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GiovaniElite · Tutor por 8 anos
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To determine which equation has no real solutions, we need to analyze each equation and see if it leads to a contradiction.
A. 3x - 3 = 3x - 3
Subtract 3x from both sides:
-3 = -3
This is a true statement and holds for all values of x. Therefore, this equation has infinitely many solutions.
B. 3(x + 3) = 3(x + 13)
Expand both sides:
3x + 9 = 3x + 39
Subtract 3x from both sides:
9 = 39
This is a contradiction, meaning there are no real solutions for this equation.
C. 3(x - 3) = 3x - 9
Expand the left side:
3x - 9 = 3x - 9
Subtract 3x from both sides:
-9 = -9
This is a true statement and holds for all values of x. Therefore, this equation has infinitely many solutions.
D. 3x - 3 = 9x - 3
Subtract 3x from both sides:
-3 = 6x - 3
Add 3 to both sides:
0 = 6x
Divide by 6:
x = 0
This equation has one solution, x = 0.
Therefore, the equation that has no real solutions is:
B. 3(x + 3) = 3(x + 13)
A. 3x - 3 = 3x - 3
Subtract 3x from both sides:
-3 = -3
This is a true statement and holds for all values of x. Therefore, this equation has infinitely many solutions.
B. 3(x + 3) = 3(x + 13)
Expand both sides:
3x + 9 = 3x + 39
Subtract 3x from both sides:
9 = 39
This is a contradiction, meaning there are no real solutions for this equation.
C. 3(x - 3) = 3x - 9
Expand the left side:
3x - 9 = 3x - 9
Subtract 3x from both sides:
-9 = -9
This is a true statement and holds for all values of x. Therefore, this equation has infinitely many solutions.
D. 3x - 3 = 9x - 3
Subtract 3x from both sides:
-3 = 6x - 3
Add 3 to both sides:
0 = 6x
Divide by 6:
x = 0
This equation has one solution, x = 0.
Therefore, the equation that has no real solutions is:
B. 3(x + 3) = 3(x + 13)
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