[tex]\displaystyle\bf\\x^{2} +px-12=0\\\\x_{1} =1,5\\\\1,5^{2} +p\cdot 1,5-12=0\\\\2,25+1,5p-12=0\\\\1,5p=9,75\\\\p=9,75:1,5\\\\\boxed{p=6,5}\\\\Teorema \ Vieta \ :\\\\x_{1} \cdot x_{2} =-12\\\\x_{2} =-12:x_{1} =-12:1,5=-8\\\\\boxed{x_{2} =-8}[/tex]
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[tex]\displaystyle\bf\\x^{2} +px-12=0\\\\x_{1} =1,5\\\\1,5^{2} +p\cdot 1,5-12=0\\\\2,25+1,5p-12=0\\\\1,5p=9,75\\\\p=9,75:1,5\\\\\boxed{p=6,5}\\\\Teorema \ Vieta \ :\\\\x_{1} \cdot x_{2} =-12\\\\x_{2} =-12:x_{1} =-12:1,5=-8\\\\\boxed{x_{2} =-8}[/tex]