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ASVAB · Algebra Basics and Equations

If f(x) = 2x - 3, what is f(7)?

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Correct answer

11

  1. A 13
  2. B 8
  3. C 17
  4. D 11

Why this is the answer

f(7) = 2(7) - 3 = 14 - 3 = 11. Function notation f(7) just means 'replace every x in the rule with 7, then evaluate'. Follow order of operations: multiply first (2 × 7 = 14), then subtract 3. The distractor 17 adds 3 instead of subtracting; 8 is 7 + 1 or 2 × 7 − 6; 13 would be f(8). Writing the substitution out, 2(7) − 3, prevents sign slips.
Source: ASVAB MK, Functions

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About this topic: Algebra Basics and Equations

Algebra basics cover solving linear equations and inequalities, working with expressions, substitution and simple systems. Do the same operation to both sides, and check your answer by substituting it back. This is one of 17 Mathematics Knowledge questions on algebra basics and equations, each with a full explanation on a single study page.

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