If we know that a minus one part of a equals 10, then the square of (a plus one part of a) equals?

If we know that a minus one part of a equals 10, then the square of (a plus one part of a) equals?

∵(a-1/a)=10
∴(a-1/a)²=10²
a²-2+1/a²=100
a²+2+1/a²=104
∴(a+1/a)²=104