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A is a perfect square trinomial, so first you factor it:

A = (x-15)(x-15)

This is a square with one side being (x-15).

So the perimeter must be (x-15)+(x-15)+(x-15)+(x-15) because a square has four sides.

So P = 4x-60

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Steel Beard

Lvl 2
4y ago

What else can I help you with?