2)Δx=x-x0=-6.5-(-6.4)=-0.1
f(x)=f(-6.5)=(-6.5)+2*(-6.5)^2-1=34.75
f(x0)=f(-6.4)=(-6.4)+2*(-6.4)^2-1=33.46
Δf=f(x)-f(x0)=34.75-33.46=1.29
Δf/Δx=1.29/(-0.1)=-12.9
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2)Δx=x-x0=-6.5-(-6.4)=-0.1
f(x)=f(-6.5)=(-6.5)+2*(-6.5)^2-1=34.75
f(x0)=f(-6.4)=(-6.4)+2*(-6.4)^2-1=33.46
Δf=f(x)-f(x0)=34.75-33.46=1.29
Δf/Δx=1.29/(-0.1)=-12.9