7:
f'(x)=x^2-x-4
=>f''(x)=2x-1
f''(x)=0
=>x=1/2
f'(1/2)=1/4-1/2-4=-17/4; f(1/2)=1/3*1/8-1/2*1/4-2+6=47/12
y-f(1/2)=f'(1/2)*(x-1/2)
=>y=47/12-17/4(x-1/2)=-17/4x+145/24
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