The voltage drop across 4k resistor is Vout? Then the voltage drop across 6k resistor is Vp?Seriously?
Look at the pic in your problem. Work from the output of the op-amp toward the ground.
At the output of the op-amp we have 4k resistor, there will be some voltage across the 4k resistor. Is it Vp?
From the 4k resistor we have another resistor, the 6k. There will be some voltage drop across the 6k resistor. Is it Vp?