упростите выражение (y-4)(y+4)-(y-3)^2
(y-4)(y+4)-(y-3)^2=y^2-16 - y^2 +6y - 9=6y-25
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(y-4)(y+4)-(y-3)^2=y^2-16 - y^2 +6y - 9=6y-25