body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Pearson Algebra 1 Common Core, 2011

PA

Pearson Algebra 1 Common Core, 2011 View details

Chapter Review

Continue to next subchapter

Exercise 21 Page 286

To evaluate f(x), substitute the given values into the equation.

f(2)=-4
f(7)=6

Practice makes perfect

To find the value of f(x)=2x-8 when x=2 and x=7, we substitute the values for x and evaluate. Let's start with when x= 2.

f(x)=2x-8

x= 2

f( 2)=2* 2-8

Multiply

f(2)=4-8

Subtract terms

f(2)=-4

When x=2, f(x)=- 4. Now Let's try when x=7.

f(x)=2x-8

x= 7

f( 7)=2* 7-8

Multiply

f(7)=14-8

Subtract terms

f(7)=6

When x=7, f(x)=6.