Solved

# Simplify expression

Posted on 2016-09-06
129 Views
Last Modified: 2016-09-06
I don't understand it how it solved. Can you please do it in a different way.
0
Question by:mustish1
[X]
###### Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points
• Learn & ask questions
3 Comments

LVL 74

Accepted Solution

sdstuber earned 250 total points
ID: 41786941
it's just substitution.  There's really no trick or other method to it. In the example they skipped some of the trivial arithmetic; but we can show all of it.

f(4+h) - f(4)

solve it in two parts

part1: f(4+h) and then part2: f(4)  when you have both, subtract part 2 from part 1

part1:  x= 4+h

so  f(x) = x^2 - 2 = (4+h)^2 - 2 = 4^2 + 8h + h^2 - 2 = 16 + 8h + h^2 -2 = h^2 + 8h +14

part2: x = 4

f(x) = x^2 - 2 = 4^2 - 2 = 16 -2 = 14

f(4+h) - f(4) =    (h^2 + 8h + 14) -  (14) = h^2 + 8h
0

LVL 27

Assisted Solution

aburr earned 250 total points
ID: 41786946
What is f(x)?
f(x) = x^2 -2
What if x = 4 +h?      what is f(x) then?   It is
f(4+h) = (4+h)^2 -2
-
What if x= 4   What is f(x) then?    It is
f(4) = 4^2 = 16- 2 = 14   so

(4+h)^2 -2 = 14    do the square

16 + 8h + h^2 – 2 = 14          simplify

h^2 + 8h
0

Author Closing Comment

ID: 41786970
Thank You.
0

## Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

### Suggested Solutions

This is a research brief on the potential colonization of humans on Mars.
This story has been written with permission from the scammed victim, a valued client of mine – identity protected by request.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
###### Suggested Courses
Course of the Month8 days, 9 hours left to enroll

#### 738 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.