∴ Quadrilateral AECD is rectangular, CE=AD=7, AE=CD=2, BE=AB-AE= 1.
∴BC? = Yes? +CE? = 1+49=50
CP? =CD? +DP? =4+x?
BP? =AP? +AB? =(7-x)? +9
∵CP? +BP? =BC? ,∴4+x? +(7-x)? +9=50
Tidy up, x? -7x+6=0, solution, x= 1 or x=6.
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