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1/4 - b/3 + b^2/9 = (1/36)(9-12b+4b²) = (1/36)(4b² - 12b + 9)
Observación: -12b=-6b-6b
Entonces:
1/4 - b/3 + b^2/9 =(1/36)(4b² - 6b -6b + 9)
1/4 - b/3 + b^2/9 = (1/36)(2b(2b-3) -3(2b-3))
1/4 - b/3 + b^2/9 = (1/36)(2b-3)(2b-3)
1/4 - b/3 + b^2/9 = (1/36)(2b-3)²
Eso es todo!! Saludos! Jeizon1L