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SL 2.6—Quadratic function - IB Questionbank | RevisionDojo

Practice SL 2.6—Quadratic function with authentic IB Mathematics Analysis and Approaches (AA) exam questions for both SL and HL students. This question bank mirrors Paper 1, 2, 3 structure, covering key topics like functions and equations, calculus, complex numbers, sequences and series, and probability and statistics. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.

Paper

Level

Question 1

SLPaper 1

The quadratic function $f(x)=a x^{2}+b x+c$ has a vertex at ( $-3,-2$ ) and passes through the point $(0,7)$ .

Write down the equation of the axis of symmetry.

[1]

Find the value of $c$ .

[2]

Sketch the graph of $f(x)$ , clearly labeling the vertex, the y-intercept, and the axis of symmetry.

[3]

Question 2

SLPaper 1

Let $f(x)=n x^{2}-3 n x$ , where $x \in \mathbb{R}$ and $n \in \mathbb{R}$ . The line $y=5 x-20$ intersects the graph of $f$ at exactly one point.

The function $f$ can be expressed in the form $f(x)=5(x-p)(x-q)$ , where $p, q \in \mathbb{R}$ . The function $f$ can also be expressed in the form $f(x)=5(x-h)^{2}+k$ , where $h, k \in \mathbb{R}$ .

Show that $n=5$ .

[4]

Find the value of $p$ and the value of $q$ .

[2]

Find the value of $h$ and the value of $k$ .

[3]

Question 3

SLPaper 1

The quadratic function is defined as $f(x)=a x^{2}+b x+c$ , where $a, b, c \in \mathbb{R}$ . The graph of $f$ intersects the line $y=2 x+4$ at exactly one point, and the vertex of the parabola is at $(-1,3)$ .

Show that $a=2$ .

[7]

Find the values of $b$ and $c$ .

[2]

Express $f(x)$ in the form $f(x)=2(x-p)^{2}+q$ , and state the values of $p$ and $q$ .

[2]

Question 4

SLPaper 1

Let $f(x)=x^{2}-4 x+1$ and $g(x)=x^{2}-4 x-3$ , where $g(x)=f(x)-4$ .

Find the discriminant of $f$ and hence solve the equation $f(x)=0$ .

[4]

Find the discriminant of $g$ and hence solve the equation $g(x)=0$ .

[4]

Find the vertex of each function.

[3]

On the axes below, sketch the graphs of $f$ and $g$ , clearly indicating the vertices and intercepts with the axes.

Figure 1: Graph for sketching $f$ and $g$

[3]

Question 5

SLPaper 1

Consider the quadratic function $f(x)=2(x+2)(x-4)$ , for $x \in \mathbb{R}$ .

Find the x -coordinates of the x -intercepts of the graph of $f$ .

[2]

ii. Find the coordinates of the vertex of the graph of $f$ . Show your working clearly.

[3]

The function $f$ can be expressed in the form $f(x)=2(x-h)^{2}+k$ . Determine the values of $h$ and $k$ by completing the square.

[3]

It is hypotheszed that a line $y=m x+5$ is tangent to the graph of $f$ at one point. Find the possible values of $m$ to show if ut is true or not.

[3]

Question 6

SL & HLPaper 1

Consider the quadratic function $f(x) = -2(x+1)^2+5$ .

The function $g(x) = x^2$ is transformed to the function $f(x) = -2(x + 1)^2 + 5$ . Describe the transformations applied to $g(x)$ to obtain $f(x)$ .

[4]

Find the vertex of the function $f(x) = -2(x + 1)^2 + 5$ and explain why it is a maximum.

[3]

Find the area between the curve $f(x)$ and $g(x)=x^2$ within the interval $[-1,0]$

[4]

Question 7

SLPaper 2

A quadratic model $f(x)=ax^2+bx+c$ is fitted to three measured points $P(1,0.5+\ln 6)$ , $Q(3,1.5+\ln 9)$ , $R(6,\ln 5)$ .

Determine $a,b,c$ (numerically). Give your values correct to 3 significant figures.

[5]

Write $f(x)$ in vertex form $f(x)=a(x-h)^2+k$ . Hence state the vertex and the range of $f$ . Give $h,k$ to 3 d.p.

[4]

Let $g(x)=\ln(x+2)+1$ . Solve $f(x)=g(x)$ for $x\ge 0$ to 3 d.p., and justify the number of solutions.

[6]

Solve $f(x)\ge g(x)$ for $x\ge 0$ .

[3]

Question 8

SLPaper 1

A quadratic has $x$ -intercepts $x=-6$ and $x=2$ , and its vertex lies on $y=-x+1$ .

Find $f(x)$ .

[5]

Determine the range of $f(x)$ .

[2]

Find $f^{-1}(x)$ with restriction.

[5]

Transformations from $y=x^2$ .

[3]

Question 9

SLPaper 2

A quadratic model $f(x)=ax^2+bx+c$ is fitted to three measured points $P(1,1+\ln 2)$ , $Q(3,e)$ , $R(6,\ln 2)$ .

Determine $a,b,c$ (numerically). Give your values correct to 3 significant figures.

[5]

Write $f(x)$ in vertex form $f(x)=a(x-h)^2+k$ . Hence state the vertex and the range of $f$ . Give $h,k$ to 3 d.p.

[4]

Let $g(x)=\ln(x+2)+1$ . Solve $f(x)=g(x)$ for $x\ge 0$ to 3 d.p., and justify the number of solutions.

[6]

Solve $f(x)\ge g(x)$ for $x\ge 0$ .

[3]

Question 10

SLPaper 1

The quadratic has $x$ -intercepts $x=1$ and $x=9$ , and its vertex lies on $y=3$ .

Find $f(x)$ .

[5]

Determine the range of $f(x)$ .

[2]

Find $f^{-1}(x)$ with a suitable domain restriction.

[5]

Describe the transformations to get $f(x)$ from $y=x^2$ .

[3]

SL 2.6—Quadratic function Questionbank