Job Recruitment Website - Immigration policy - Urgent: It is known that y = √ (x-7)+√ (7-x)+9 to find (xy-64)? arithmetic square root
Urgent: It is known that y = √ (x-7)+√ (7-x)+9 to find (xy-64)? arithmetic square root
Greater than or equal to 0 under the root sign
x-7 & gt； =0，x & gt=7
7-x & gt； =0，x & lt=7
Meanwhile, x=7.
x-7=0，7-x=0
So y = √ (x-7)+√ (7-x)+9 = 9.
(xy-64)？ The arithmetic square root of = (7× 9-64)? = (- 1) arithmetic square root? The arithmetic square root of = 1
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