
Concept explainers
To find: The real number that is exactly 1 less than its fourth power.

Answer to Problem 45E
The real numbers that are exactly 1 less than its fourth power are x=−0.724 and x=1.221.
Explanation of Solution
Given information: The number is exactly 1 less than its fourth power.
Calculation:
Assume that x be the real number such that the number is exactly 1 less than its fourth power. So, the difference between the fourth power of number and number is 1.
x4−x=1
Solve the equation x4−x=1 with the help of graph.
First press “ON” button on graphical calculator, press Y= key and enter left hand side of the equation after the symbol Y1 . Enter the keystrokes X^4−X . Now press the ENTER key and enter right hand side of the equation after the symbol Y2 . Enter the keystrokes 1.
The display will show the equations,
Y1=X^4−XY2=1
Now, press the GRAPH key and TRACE key to produce the graph of given function in standard window as shown below.
Figure (1)
As observed from the graph, both the graphs intersect at two points x=−0.724 and x=1.221.
So, the solution of the equation x4−x=1 are x=−0.724 and x=1.221.
Therefore, the real number that is exactly 1 less than its fourth power are x=−0.724 and x=1.221.
Chapter 2 Solutions
Calculus: Graphical, Numerical, Algebraic
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