1. Find the gradient of the tangent to the curve at $x = 1$.
The tangent passes through (1,−2) and (0,13).
Gradient of tangent, m=0−113−(−2)=−115=−15
Therefore, f′(1)=−15.
2. Integrate $\mathrm{f}''(x)$ to find the general expression for $\mathrm{f}'(x)$.
f′(x)=∫(6x−10)dx
f′(x)=3x2−10x+C
3. Find the constant of integration $C$.
Substitute x=1 and f′(1)=−15:
3(1)2−10(1)+C=−15
3−10+C=−15
−7+C=−15
C=−8
So, f′(x)=3x2−10x−8.
4. Integrate $\mathrm{f}'(x)$ to find the general expression for $\mathrm{f}(x)$.
f(x)=∫(3x2−10x−8)dx
f(x)=x3−5x2−8x+D
5. Find the constant of integration $D$ to determine the equation of the curve.
The curve passes through (1,−2). Substitute x=1 and f(1)=−2:
(1)3−5(1)2−8(1)+D=−2
1−5−8+D=−2
−12+D=−2
D=10
Therefore, the equation of the curve is y=x3−5x2−8x+10.
答案y=x3−5x2−8x+10