Download presentation

Published byColt Guthridge Modified over 9 years ago

1
**Evaluate the expression for the given value(s) of the variable(s).**

Example 4 Evaluating Algebraic Expressions Evaluate the expression for the given value(s) of the variable(s). 3x + 4, x = 7 a. – s = 2, b. p 4 10s 3 3p 2, SOLUTION 3x + 4 = 3 a. ( ) 7 Substitute 7 for x. = 21 + 4 Multiply. = 25 Add.

2
**Example 4 b. 10s 3 – 3p 2 = 10 ( ) 3 2 – 3 ( ) 2 4 = 10 ( ) 8 – 3 16 =**

Evaluating Algebraic Expressions b. 10s 3 – 3p 2 = 10 ( ) 3 2 – 3 ( ) 2 4 Substitute 2 for s and 4 for p. Evaluate powers. = 10 ( ) 8 – 3 16 = 80 Multiply. – 48 = 32 Subtract.

3
Example 5 Evaluating a Real-Life Expression WATERFALL A river carries a stone over a waterfall. The stone hits the water 5 seconds later. To find the height of the waterfall, use the expression 16t2, which gives the distance in feet that a dropped object falls in t seconds. SOLUTION 16t 2 = 16 ( ) 2 5 Substitute 5 for t. Evaluate the power. 16 ( ) 25 = = 400 Multiply.

4
**The waterfall is about 400 feet high.**

Example 5 Evaluating a Real-Life Expression ANSWER The waterfall is about 400 feet high.

5
**Evaluate the expression for the given value(s) of the variable(s).**

Guided Practice for Examples 4 and 5 Evaluate the expression for the given value(s) of the variable(s). 17. 4r + 6, r = 5 ANSWER 26 18. ( ), 5 – y 3 = 8 ANSWER 9 19. n2 + q3, n = 1, q 2 ANSWER 9

6
**Guided Practice 20. WHAT IF?**

for Examples 4 and 5 20. WHAT IF? In Example 5, suppose the stone hits the water after 2 seconds. Find the height of the waterfall. ANSWER 64 ft

Similar presentations

© 2024 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google