### Home > CC3MN > Chapter 3 > Lesson 3.1.2 > Problem3-15

3-15.

Evaluate the following expressions given the values below.

1. $ab+bc+ac$ for $a=2$, $b=5$, and $c=3$

Substitute the values given for $a$, $b$, and $c$ into the equation.

$(2)(5)+(5)(3)+(2)(3)$

$=31$

2. $\frac { 20 - x ^ { 2 } } { y - x }$ for $x=−2$ and $y=6$

See the hint in part (a).