Identify Restrictions: Identify the restrictions for the denominator, since division by zero is undefined.4−x2−9=0
Solve Denominator: Solve for x where the denominator equals zero.x2−9=4
Square Root Elimination: Square both sides to eliminate the square root. (x2−9)=16
Move to Right Side: Move 9 to the right side.x2=25
Take Square Root: Take the square root of both sides.x=±5
Check Solutions: Since we squared during our steps, we need to check if these solutions don't cause the original denominator to be zero.Plug x=5 and x=−5 back into the original denominator.4−52−9=4−16=4−4=04−(−5)2−9=4−16=4−4=0Both x=5 and x=−5 make the denominator zero, so they are not in the domain.
Identify Square Root Restrictions: Identify the restrictions for the square root in the denominator, since square roots are only defined for non-negative numbers. x2−9≥0
Factor and Solve: Factor the left side.(x+3)(x−3)≥0
Find Intervals: Find the intervals where the inequality is satisfied. x≤−3 or x≥3
Combine Restrictions: Combine the restrictions from the denominator and the square root.The domain is all x such that x≤−3 or x≥3, but not including x=5 or x=−5.
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