Solve: $| 7 x - 9 |$ ?-3
A) $\left( - \infty , \frac { 6 } { 7 } \right]$
B) $\left[ \frac { 6 } { 7 } , \frac { 12 } { 7 } \right]$
C) $( - \infty , \infty )$
D) $\varnothing$

Question

Quizplus · Accepted Answer

Since absolute values are always non-negative, we can never get a negative number on the left hand side. Therefore, the inequality has no solutions and the answer is the empty set, or $\varnothing$.

Solve ∣7x−9∣| 7 x - 9 |∣7x−9∣ ?-3 A) (−∞,67]\left( - \infty , \frac { 6 } { 7 } \right](−∞,76​]

Solve $| 7 x - 9 |$ ?-3
A) $\left( - \infty , \frac { 6 } { 7 } \right]$