11 + 17i is an IMAGINARY number. .
Its conjugate is 11 - 17i
NB Note the change of sign only.
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The conjugate of 6 + i is 6 - i.
8 - 8i
The product is a^2 + b^2.
3 + 11 + 11 + 11 + 12 + 13 + 15 + 15 + 16 + 17 + 19 = 143
[ 2 minus square root of 5 ] is the only one.