Debes aplicar la fórmula del cuadrado de un binomio.
( a - b )² = a² - 2ab + b²
( 9 - x )² = 81 - 18x + x²
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Debes aplicar la fórmula del cuadrado de un binomio.
( a - b )² = a² - 2ab + b²
( 9 - x )² = 9² - (2)(9) x + x²( 9 - x )² = 81 - 18x + x²