If curve y2 = 4x and xy = c cut at right angles, then the value of c is
A. 4√2
B. 8
C. 2√2
D. -4√2
Answer:A
If curve y2 = 4x and xy = c cut at right angles, then the value of c is
A. 4√2 B. 8 C. 2√2 D. -4√2