A curve is such that dxdy=(2x−1)26 and P(2,9) is a point on the curve. The normal to the curve at P meets the y-axis at Q and the x-axts at R. Find the coordinates of the midpoint of QR.
Q. A curve is such that dxdy=(2x−1)26 and P(2,9) is a point on the curve. The normal to the curve at P meets the y-axis at Q and the x-axts at R. Find the coordinates of the midpoint of QR.
Differentiate and Identify Gradient: Identify the gradient of the curve at any point by differentiating the given equation.Given: dxdy=(2x−1)26
Find Normal Gradient at P(2,9): Find the gradient of the normal to the curve at point P(2,9).The gradient of the normal is the negative reciprocal of the gradient of the curve.Gradient of the curve at P: dxdy=(2∗2−1)26=(3)26=96=32Gradient of the normal at P: −23
Equation of Normal through P: Use the point-gradient form to find the equation of the normal.Point-gradient form: y−y1=m(x−x1)Using point P(2,9) and gradient −23, we get:y−9=−23(x−2)
Find Y-Intercept Q: Rearrange the equation of the normal to find the y-intercept (Q).y=−23x+3+9y=−23x+12The y-intercept Q is at (0, 12).
Find X-Intercept R: Find the x-intercept (R) by setting y to 0 in the equation of the normal.0=−23x+1223x=12x=2312x=312∗2x=8The x-intercept R is at (8, 0).
Calculate Midpoint of QR: Calculate the midpoint of QR using the midpoint formula.Midpoint formula: (2x1+x2,2y1+y2)Using Q(0, 12) and R(8, 0), we get:Midpoint of QR: (20+8,212+0)Midpoint of QR: (4,6)
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