Respostas

2013-08-16T16:27:05-03:00
Substituindo o valor de x por 8, podemos obter o valor de p:


2x^2-3px+40=0\\\\
2(8)^2-3\cdot p\cdot8+40=0\\\\
2\cdot64-24p+40=0\\\\\
128-24p+40=0\\\\
24p=168\\\\
p=\dfrac{168}{24}\\\\
\boxed{p=7}
2 5 2