Consider the function

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

r(x)=2x^{2}-4x+5

. Which of the following is the equation of the line tangent to the graph of

r

that is parallel to the line

3y=9x+4

? (a)

y = 9x-\dfrac{129}{8}

(b)

y = 3x-\dfrac{9}{8}

(c)

y = -\dfrac{1}{3}x+\dfrac{33}{8}

(d)

y = 3x-\dfrac{33}{8}