(y-13)²=y²-2*13y+169=y²-26y+169
(13-y)²=169-2*13y+y²=169-26y+y²
(b²-11)=(b-V11)(b+V11)
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(y-13)²=y²-2*13y+169=y²-26y+169
(13-y)²=169-2*13y+y²=169-26y+y²
(b²-11)=(b-V11)(b+V11)