I need help. It is 6th-grade math. Plz help!!! I am giving 100 points plz help!

Answer:
3 ft.²
Step-by-step explanation:
Just substitute 3 into where x is.
(3)²-2×3 = 9-6 = 3
∴ The area of the room is 3 ft.²
Answer:
the value is 3
Step-by-step explanation:
x^2-2x
3^2-2*3
3