The answer (2,6) hope that helps
Assuming you mean
(x-2)²=49
sqare root both sides and take positive and negative roots
x-2=+/-7
add 2 to both sides
x=2+/-7
x=2+7 and 2-7
x=9 and -5
U varies inversely which means p³ will come as a denominator of the constant k.
Therefore, The equation formed will be:

8+4p+2q+r=0
27+9p+3q+r=0
64+16p+4q+r=0
P=-9
Q=26
R=-24
2.875 would be the answer