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Given the curve y = 4x2 − 6x + 5 and x=1.

Mathematics

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Answer

x+2y−7=0x + 2y - 7 = 0

Graph of y = 4x² − 6x + 5

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Key points of y = 4x² − 6x + 5
Pointxy
y-intercept05
Minimum0.752.75

Step-by-step solution

4 steps
  1. Find the y-coordinate of the point on the curve.

    Given the curve y=4x2−6x+5y = 4x^2 - 6x + 5 and x=1x=1.
    Substitute x=1x=1 into the equation to find the corresponding yy-value:

    y=4(1)2−6(1)+5y = 4(1)^2 - 6(1) + 5 y=4−6+5y = 4 - 6 + 5 y=3y = 3

    So, the point on the curve is (1,3)(1, 3).

  2. Find the gradient of the tangent to the curve.

    Differentiate the curve's equation with respect to xx to find the gradient function dydx\frac{dy}{dx}:

    dydx=ddx(4x2−6x+5)\frac{dy}{dx} = \frac{d}{dx}(4x^2 - 6x + 5) dydx=8x−6\frac{dy}{dx} = 8x - 6

    Now, evaluate the gradient of the tangent at x=1x=1:

    mtangent=8(1)−6m_{\text{tangent}} = 8(1) - 6 mtangent=8−6m_{\text{tangent}} = 8 - 6 mtangent=2m_{\text{tangent}} = 2
  3. Find the gradient of the normal to the curve.

    The normal is perpendicular to the tangent. If mtangentm_{\text{tangent}} is the gradient of the tangent, then the gradient of the normal mnormalm_{\text{normal}} is given by mnormal=−1mtangentm_{\text{normal}} = -\frac{1}{m_{\text{tangent}}}.

    mnormal=−12m_{\text{normal}} = -\frac{1}{2}
  4. Find the equation of the normal.

    Use the point-slope form of a linear equation, y−y1=m(x−x1)y - y_1 = m(x - x_1), with the point (x1,y1)=(1,3)(x_1, y_1) = (1, 3) and the gradient m=−12m = -\frac{1}{2}:

    y−3=−12(x−1)y - 3 = -\frac{1}{2}(x - 1)

    Multiply both sides by 2 to eliminate the fraction:

    2(y−3)=−1(x−1)2(y - 3) = -1(x - 1) 2y−6=−x+12y - 6 = -x + 1

    Rearrange the equation into the standard form Ax+By+C=0Ax + By + C = 0:

    x+2y−6−1=0x + 2y - 6 - 1 = 0 x+2y−7=0x + 2y - 7 = 0

    The equation of the normal to the curve at x=1x=1 is x+2y−7=0\boxed{x + 2y - 7 = 0}.

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