### Home > ACC7 > Chapter 2 Unit 1 > Lesson CC3: 2.1.4 > Problem2-43

2-43.

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

1. $2+3x$  for  $x=4$

Rewrite the expression, substituting in the known variable.

$2+3(4)$
$2+12$

$14$

2. $4−5c$  for  $c =- \frac { 1 } { 2 }$

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

$6.5$

3. $3d^2−1$ 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.