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Function Evaluation — Easy Worksheet 2
Grade 9 · MathSheets Name: ____________________ Date: __________
Evaluate each function.
How to solve
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Example
If f(x) = 6x - 5, find f(8).
Answer: 43
Not quite. The answer is
💡 Substitute 6 for x: f(6) = 3(6) + 5 = 18 + 5 = 23. The answer is 23.
✓ Correct!
Not quite. The answer is
💡 Substitute 6 for x: f(6) = 3(6) + 5 = 18 + 5 = 23. The answer is 23.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 5x + 5, find f(1).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute 2 for x: f(2) = 2(2) − 1 = 4 − 1 = 3. The answer is 3.
✓ Correct!
Not quite. The answer is
💡 Substitute 2 for x: f(2) = 2(2) − 1 = 4 − 1 = 3. The answer is 3.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 6x - 6, find f(0).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute −2 for x: f(−2) = 5(−2) + 7 = −10 + 7 = −3. The answer is −3.
✓ Correct!
Not quite. The answer is
💡 Substitute −2 for x: f(−2) = 5(−2) + 7 = −10 + 7 = −3. The answer is −3.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 5x - 5, find f(8).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute −5 for x: f(−5) = 6(−5) − 9 = −30 − 9 = −39. The answer is −39.
✓ Correct!
Not quite. The answer is
💡 Substitute −5 for x: f(−5) = 6(−5) − 9 = −30 − 9 = −39. The answer is −39.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 4x - 2, find f(-3).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute −7 for x: f(−7) = 5(−7) − 9 = −35 − 9 = −44. The answer is −44.
✓ Correct!
Not quite. The answer is
💡 Substitute −7 for x: f(−7) = 5(−7) − 9 = −35 − 9 = −44. The answer is −44.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 5x + 9, find f(-1).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute −1 for x: f(−1) = 4(−1) − 5 = −4 − 5 = −9. The answer is −9.
✓ Correct!
Not quite. The answer is
💡 Substitute −1 for x: f(−1) = 4(−1) − 5 = −4 − 5 = −9. The answer is −9.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 5x - 10, find f(-5).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute 1 for x: f(1) = 6(1) − 7 = 6 − 7 = −1. The answer is −1.
✓ Correct!
Not quite. The answer is
💡 Substitute 1 for x: f(1) = 6(1) − 7 = 6 − 7 = −1. The answer is −1.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 5x - 10, find f(-5).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 Substitute −8 for x: f(−8) = 5(−8) + 3 = −40 + 3 = −37. The answer is −37.
✓ Correct!
Not quite. The answer is
💡 Substitute −8 for x: f(−8) = 5(−8) + 3 = −40 + 3 = −37. The answer is −37.
💡 How to solve: Function Evaluation
Replace every x in the rule with the given number, using parentheses around negative numbers. Then simplify using order of operations: exponents first, then multiplication, then addition and subtraction.
Try a similar one
If f(x) = 2x - 5, find f(-8).
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Function Evaluation — Easy Worksheet 2
Evaluate each function.