Math  /  Algebra

QuestionDetermine algebraically whether the given function is even, odd, or neither. f(x)=2x+5xf(x)=2 x+|-5 x|
Choose the correct answer. Even Neither

Studdy Solution

STEP 1

1. A function f(x) f(x) is even if f(x)=f(x) f(-x) = f(x) for all x x in the domain.
2. A function f(x) f(x) is odd if f(x)=f(x) f(-x) = -f(x) for all x x in the domain.
3. The function given is f(x)=2x+5x f(x) = 2x + |-5x| .

STEP 2

1. Determine f(x) f(-x) .
2. Compare f(x) f(-x) with f(x) f(x) to check for evenness.
3. Compare f(x) f(-x) with f(x)-f(x) to check for oddness.
4. Conclude whether the function is even, odd, or neither.

STEP 3

Determine f(x) f(-x) by substituting x-x into the function:
f(x)=2(x)+5(x) f(-x) = 2(-x) + |-5(-x)|
Simplify the expression:
f(x)=2x+5x f(-x) = -2x + |5x|

STEP 4

Compare f(x) f(-x) with f(x) f(x) to check for evenness:
f(x)=2x+5x f(x) = 2x + |-5x|
f(x)=2x+5x f(-x) = -2x + |5x|
For f(x) f(x) to be even, f(x) f(-x) should equal f(x) f(x) . Clearly:
2x+5x2x+5x 2x + |-5x| \neq -2x + |5x|
So, the function is not even.

STEP 5

Compare f(x) f(-x) with f(x)-f(x) to check for oddness:
f(x)=(2x+5x)=2x5x -f(x) = -(2x + |-5x|) = -2x - |-5x|
f(x)=2x+5x f(-x) = -2x + |5x|
For f(x) f(x) to be odd, f(x) f(-x) should equal f(x)-f(x). Clearly:
2x+5x2x5x -2x + |5x| \neq -2x - |-5x|
So, the function is not odd.

STEP 6

Since the function is neither even nor odd, we conclude:
The function is neither\boxed{\text{neither}}.

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