Final answer:
To determine the value of x for ABCD to be a rhombus, given that AB=x and BC=2x-3, we set x equal to 2x-3 and solve for x, finding that x must equal 3.
Step-by-step explanation:
To evaluate x so that ABCD is a rhombus, we must remember that in a rhombus all sides are equal. Given that AB=x and BC=2x-3, for ABCD to be a rhombus, AB must be equal to BC.
Setting the two expressions equal to each other because all sides must be the same in a rhombus:
x = 2x - 3
We then solve for x by subtracting x from both sides:
0 = x - 3
Adding 3 to both sides, we get:
x = 3
Therefore, x must equal 3 for quadrilateral ABCD to be a rhombus.