英文导数题
Thecurvey=ax^2+bx+cpassesthroughthepointA(-2,0)abdB(3,20).TheslopeofthenormalatAis1an...
The curve y=ax^2+bx+c passes through the point A(-2, 0) abd B(3, 20). The slope of the normal at A is 1 and the gradient of the tangent at B is 9. Find the values of a, b and c.
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