Answer:
x = 15 units
Step-by-step explanation:
The diagonal splits the rectangle into 2 right triangles where the diagonal is the hypotenuse
Using Pythagoras' identity to find x
x² + 8² = 17²
x² + 64 = 289 ( subtract 64 from both sides )
x² = 225 ( take the square root of both sides )
x = [tex]\sqrt{225}[/tex] = 15 units
