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A curve C is described by the equation 3x^2 - 2y^2 + 2x - 3y + 5 = 0 - Edexcel - A-Level Maths Pure - Question 3 - 2006 - Paper 6

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A curve C is described by the equation 3x^2 - 2y^2 + 2x - 3y + 5 = 0. Find an equation of the normal to C at the point (0, 1), giving your answer in the form ax + b... show full transcript

Worked Solution & Example Answer:A curve C is described by the equation 3x^2 - 2y^2 + 2x - 3y + 5 = 0 - Edexcel - A-Level Maths Pure - Question 3 - 2006 - Paper 6

Step 1

Differentiate the equation implicitly

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Answer

To find the normal, we first need to differentiate the equation of the curve implicitly. Differentiating both sides gives: 6x4ydydx+2+2x3dydx=06x - 4y \frac{dy}{dx} + 2 + 2x - 3 \frac{dy}{dx} = 0

This simplifies to: 6x+2(4y+3)dydx=06x + 2 - (4y + 3) \frac{dy}{dx} = 0

Step 2

Find the derivative at the point (0, 1)

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Answer

Next, we substitute the point (0, 1) into the derivative: At (0, 1): 6(0)+2(4(1)+3)dydx=06(0) + 2 - (4(1) + 3) \frac{dy}{dx} = 0 This simplifies to: 27dydx=02 - 7 \frac{dy}{dx} = 0 Thus: dydx=27\frac{dy}{dx} = \frac{2}{7}

Step 3

Determine the slope of the normal

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Answer

The slope of the normal line is the negative reciprocal of the derivative: mnormal=127=72m_{normal} = -\frac{1}{\frac{2}{7}} = -\frac{7}{2}

Step 4

Formulate the equation of the normal

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Using the point-slope form of the equation of a line, we have: y1=mnormal(x0)y - 1 = m_{normal}(x - 0) Substituting the value of the normal slope: y1=72(x)y - 1 = -\frac{7}{2}(x) This can be rearranged to: 7x+2y2=07x + 2y - 2 = 0 Thus, in the form ax + by + c = 0, we have a = 7, b = 2, c = -2.

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