the given expression is,
h(x)= x²-5x+7
for, h(-8) put x = -8
h(-8) = (-8)^2 - 5(-8) + 7
h(-8) = 64 + 40 + 7
h(-8) = 111
so, 1/3 times of h(-8)
[tex]\begin{gathered} =\frac{1}{3}\times h(-8) \\ =\frac{1}{3}\times111 \\ =\frac{111}{3} \end{gathered}[/tex]so the answer is 111/3