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Home > CC3 > Chapter 2 > Lesson 2.1.4 > Problem 2-43

2-43.

Read the Math Notes box in this lesson.  Then evaluate each expression below.  Homework Help ✎

  1. 2 + 3x  for  x = 4

    Rewrite the expression, substituting in the known variable.

    2 + 3(4)
    2 + 12

    14

  2. 4 − 5c  for  c =

    See part (a) for a strategy to evaluate this expression. Remember to pay attention to negative signs.

    6.5

  3. 32 − 1  for  d = −5

    3(−5)2 − 1
    3(25) − 1
    75 − 1

    74

  4. −4(r − 2)  for  r = −1

    Refer to parts (a) and (c).

  5. 3(t − 12)2 − 1  for  t = 14

    Rewrite the problem, substituting in the known variable and then solve.