Question 349941
{{{h(x)=x^2+8x}}}
.
.
.
{{{h(-1)=(-1)^2+8(-1)=1-8=-7}}}
{{{h(-5)=(-5)^2+8(-5)=25-40=-15}}}
.
.
.
{{{(DELTA*f)/(DELTA*x)=(h(-1)-h(-5))/(-1-(-5))=(-7-(-15))/(-1+5)=8/4=2}}}