Math Problem Statement
Functions [f] (solid) and [g] (dashed) are graphed. Two congruent cubic graphs labeled f and g on an x y coordinate plane. The x- and y- axes scale by two. The graph labeled f has point at (negative two, negative two). It increases from left to right and is concave down from the interval of negative five to negative two and is concave up from the interval negative two to two. The graph labeled g has point at (negative two, two). It decreases from left to right and is concave up from the interval of negative five to negative two and is concave down from the interval negative two to two. [\small{2}] [\small{4}] [\small{6}] [\small{8}] [\small{\llap{-}2}] [\small{\llap{-}4}] [\small{\llap{-}6}] [\small{\llap{-}8}] [\small{2}] [\small{4}] [\small{6}] [\small{8}] [\small{\llap{-}2}] [\small{\llap{-}4}] [\small{\llap{-}6}] [\small{\llap{-}8}] [y] [x] [\blueD f] [\maroonD g] [f] is defined as
[f(x)=\dfrac{1}4(x+2)^3-2]. What is the equation of [g]?
Solution
The graphs of and appear to be transformations of each other. To determine the equation of , let’s analyze the relationship between and :
-
The function is given by:
-
Observing the graph:
- The graph of appears to be a reflection of over the -axis.
- A reflection over the -axis changes the sign of the output of , giving .
-
Applying the reflection: Substituting into , we have:
-
Simplify: Distribute the negative sign:
Thus, the equation of is:
Summary:
The equation of is:
Would you like me to plot or verify this result?
Relative Questions:
- How do reflections over the - and -axes affect equations of functions?
- What other transformations could make from ?
- How does the vertex of and relate geometrically?
- Can be represented as a shifted version of another cubic function?
- How would behave if reflected again?
Tip:
When reflecting a graph over the -axis, negate the entire function .
Ask a new question for Free
By Image
Drop file here or Click Here to upload
Math Problem Analysis
Mathematical Concepts
Cubic Functions
Reflections
Transformations
Formulas
f(x) = (1/4)(x + 2)^3 - 2
g(x) = -f(x)
Theorems
Reflection over the x-axis negates the function's output
Suitable Grade Level
Grades 9-12