To determine the value of \(x\) that makes \(ABCD\) a rectangle, we need to recognize that the diagonals of a rectangle are equal in length.
We are given:
- The length of diagonal \(AC\) as \(x + 7\).
- The length of diagonal \(BD\) as \(3x - 5\).
Setting the lengths of diagonals equal gives us the equation:
\[ x + 7 = 3x - 5 \]
Now, we solve for \(x\):
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Rearranging the equation to isolate \(x\): \[ 7 + 5 = 3x - x \] \[ 12 = 2x \]
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Dividing both sides by 2: \[ x = 6 \]
Thus, the value of \(x\) that makes \(ABCD\) a rectangle is \(x = 6\).
The correct response is: x equals 6.