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[" 18.The curve "y=ax^(3)+bx^(2)+cx+5" ,...

[" 18.The curve "y=ax^(3)+bx^(2)+cx+5" ,touches the "x" -axis at "F(-2,0)" a cust in "x" ,"x" ."],[" its gradient is "3" .Find a,b "," c."],[" 19.Find the gradient of the line passing through the point "(2,8)" and touching the curve "y=x^(3)" ."],[" (a) "(a)" .Find the value of "n" so that the subnormal at any point on the curve "xy^(n)=a^(n+1)" may "b]

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