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math,correction

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Add or subtract as indicated. Express your result in simplest form.

(4y)/(y^2+6y+5) plus (2y)/(y^2-1)
My answer is: (6y)/((y+5)(y-1))
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Geometry. Refer to the triangle in the figure. Find an expression that represents its perimeter

It has the following: (3)/(4x), (5)/(x^2),(1)/(x^2)

My answer: by using the formula for permiter that is P=a+b+c

My answer for this is: (3(8+x))/(4x^2)

first: I don't agree with the denominator: shouldn't it be
(y+1 )*(y-1)(y+5)

second correct.

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