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*Ya que sabemos esto, aplicamos la fórmula:
(x+2)²=x²+2(2)(x)+2²
(x+2)²=x²+4x+4
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*Finalmente quedaría asi:
(x+2)²-3
x²+4x+4-3
x²+4x+1
Espero que te sirva Saludoos :D