Explicación paso a paso:
AREA : Bxh
b=base
h=altura
(x-4)(x-4)=(x-4)²
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Explicación paso a paso:
AREA : Bxh
b=base
h=altura
(x-4)(x-4)=(x-4)²
(x²-8x+16)/2
-4x+8
x²+8
x²-8x+16
asi que tampoco me ayuda