Question 33 (3 marks)At the point (2,−5) on the curve y=f(x), the tangent has the equation 2x−y−9=0. Determine the equation of the tangent to the curve y=4−2f(3+2x) at the point (−2,14), showing all reasoning.
Q. Question 33 (3 marks)At the point (2,−5) on the curve y=f(x), the tangent has the equation 2x−y−9=0. Determine the equation of the tangent to the curve y=4−2f(3+2x) at the point (−2,14), showing all reasoning.
Determine Derivative at 2,−5: Determine the derivative of f(x) using the given tangent equation at 2,−5. The slope of the tangent line is the derivative of the function at that point. The equation of the tangent is 2x−y−9=0, rearrange to y=2x−9. The slope (derivative) at x=2 is 2.
Find f′(x) at x=2: Use the derivative to find f′(x). Since the slope of the tangent to y=f(x) at x=2 is 2, f′(2)=2.
Derivative of y: Find the derivative of y=4−2f(3+2x). Using the chain rule, dxdy=−2⋅f′(3+2x)⋅(21). Simplify to dxdy=−f′(3+2x).
Find Slope at x=−2: Substitute x=−2 into the derivative to find the slope of the tangent at that point. dxdy at x=−2 is −f′(3+(−2)/2)=−f′(2)=−2.
Equation of Tangent at (−2,14): Use the point-slope form of the equation of a line to find the equation of the tangent at (−2,14). The slope is −2 and the point is (−2,14). Equation: y−14=−2(x+2).
Simplify Tangent Equation: Simplify the equation of the tangent. y−14=−2x−4, so y=−2x+10.
More problems from Write a quadratic function from its x-intercepts and another point