CPM Homework Help : CC3MN Problem 2-80

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2-80.

Evaluate the expressions below for the given values.

$6m+2n^2$ for $m=7$ and $n=3$
Step 1 (a):
Substitute the given values for the variables $m$ and $n$ .

$6(7)+2\left(3^2\right)$
Step 2 (a):
Simplify the expression.
$42+18=60$
Answer (a):
$60$

$\frac { 5 x } { 3 } - 2$ for $x=−18$
Hint (b):
Substitute $−18$ for $x$ in the expression. Then simplify.

$( 6 x ) ^ { 2 } - \frac { x } { 5 }$ for $x=10$
Hint (c):
After substituting $10$ for $x$ , the expression becomes:
$(6\cdot10)^{2}-\frac{10}{5}$

$(k−3)(k+2)$ for $k=1$
Hint (d):
Replace each $k$ with $1$ , and then simplify the expression.
Answer (d):
$−6$

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