Question
Solve the inequality
Solve the inequality by testing the values in the interval
Solve for x
x∈(−∞,−412)∪(412,+∞)
Evaluate
x4>12
Move the expression to the left side
x4−12>0
Rewrite the expression
x4−12=0
Move the constant to the right-hand side and change its sign
x4=0+12
Removing 0 doesn't change the value,so remove it from the expression
x4=12
Take the root of both sides of the equation and remember to use both positive and negative roots
x=±412
Separate the equation into 2 possible cases
x=412x=−412
Determine the test intervals using the critical values
x<−412−412<x<412x>412
Choose a value form each interval
x1=−3x2=0x3=3
To determine if x<−412 is the solution to the inequality,test if the chosen value x=−3 satisfies the initial inequality
More Steps

Evaluate
(−3)4>12
Calculate
34>12
Calculate
81>12
Check the inequality
true
x<−412 is the solutionx2=0x3=3
To determine if −412<x<412 is the solution to the inequality,test if the chosen value x=0 satisfies the initial inequality
More Steps

Evaluate
04>12
Calculate
0>12
Check the inequality
false
x<−412 is the solution−412<x<412 is not a solutionx3=3
To determine if x>412 is the solution to the inequality,test if the chosen value x=3 satisfies the initial inequality
More Steps

Evaluate
34>12
Calculate
81>12
Check the inequality
true
x<−412 is the solution−412<x<412 is not a solutionx>412 is the solution
Solution
x∈(−∞,−412)∪(412,+∞)
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