To find the value of \( x \) given that \( ABCD \) is a rectangle and that \( AO = 4x - 3 \) and \( BO = 5x - 10 \), we need to use the property that opposite sides of a rectangle are equal.
In a rectangle, the lengths of two adjacent sides are equal when measured from the same point (the origin \( O \) in this case). Therefore, we can set the two expressions equal to each other:
\[ 4x - 3 = 5x - 10 \]
Now, let's solve for \( x \).
- Rearranging the equation to collect all \( x \) terms on one side:
\[ 4x - 5x = -10 + 3 \]
- This simplifies to:
\[ -x = -7 \]
- Multiplying both sides by -1:
\[ x = 7 \]
Thus, the value of \( x \) is
\[ \boxed{7} \]