Math Problem Statement

The graph of f(x) contains the point (1,1). What point must be on the graph of (a) f(x) + 1, (b) f(x + 1), and (c) f(x - 3) - 2?

Solution

Let's go over each part of the problem step by step:

Given:

  • The graph of f(x)f(x) contains the point (1,1)(1, 1), meaning f(1)=1f(1) = 1.

Now let's address each question:


(a) What point must be on the graph of f(x)+1f(x) + 1?

When we add 1 to f(x)f(x), the entire graph of f(x)f(x) shifts up by 1 unit. This means:

  • f(x)+1f(x) + 1 will have a new point where the yy-coordinate increases by 1.

For the point (1,1)(1, 1) on f(x)f(x), it becomes:

  • f(1)+1=1+1=2f(1) + 1 = 1 + 1 = 2

So the new point will be (1,2)(1, 2).


(b) What point must be on the graph of f(x+1)f(x + 1)?

When we replace xx with x+1x + 1, the graph of f(x)f(x) shifts left by 1 unit. This means:

  • The point (1,1)(1, 1) shifts to the left by 1 unit on the xx-axis.

For the point (1,1)(1, 1) on f(x)f(x), it becomes:

  • (11,1)=(0,1)(1 - 1, 1) = (0, 1)

So the new point will be (0,1)(0, 1).


(c) What point must be on the graph of f(x3)2f(x - 3) - 2?

When we replace xx with x3x - 3, the graph shifts right by 3 units, and subtracting 2 from f(x)f(x) shifts it down by 2 units.

For the point (1,1)(1, 1) on f(x)f(x), it becomes:

  • First, shift right by 3 units: (1+3,1)=(4,1)(1 + 3, 1) = (4, 1)
  • Then, shift down by 2 units: (4,12)=(4,1)(4, 1 - 2) = (4, -1)

So the new point will be (4,1)(4, -1).


Summary of answers:

  • (a) (1,2)(1, 2)
  • (b) (0,1)(0, 1)
  • (c) (4,1)(4, -1)

Would you like more details on how these transformations work? Here are some related questions to deepen your understanding:

  1. How do vertical transformations affect the graph of a function?
  2. What happens to the graph of f(x)f(x) when xx is replaced with xax - a?
  3. What is the effect of adding a constant to f(x)f(x)?
  4. Can you explain the difference between horizontal and vertical shifts?
  5. What does it mean geometrically when a function is shifted?

Tip: When adjusting functions for transformations, focus on one transformation at a time, such as shifts, stretches, or reflections.

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Math Problem Analysis

Mathematical Concepts

Function Transformations
Graph Shifting

Formulas

Vertical Shift: f(x) + k shifts the graph vertically by k units.
Horizontal Shift: f(x - a) shifts the graph horizontally by a units.

Theorems

Shifting Theorem
Vertical and Horizontal Shifts of Functions

Suitable Grade Level

Grades 9-11