Question

omg

Answer 1

can someone break this down for me to see

Answer 2

what is f?

Answer 3

\[=\frac{ 2 }{ 5 }\sum_{i=1}^{5}\frac{ -4i^2+125 }{ 25 }\]

Answer 4

oh f = -x^2 + 5

Answer 5

f(x)=-x^2+5

Answer 6

Separate them in to seperate fractions.

Answer 7

\(\sf \color{red}{i^2} = \color{blue}{\frac{n(n+1))2n+1)}{6}}\)

Answer 8

\[\frac { 2 }{ 5 } \left[ \frac{ 4 }{ 5 }\sum_{i=1}^{5}\ i^2 + \sum_{i=1}^{5} 5 \right]\]

Answer 9

yep. U got it.

Answer 10

2/5[4/5 * (n(n+1)(2n+1))/6 + 25]

Answer 11

I am not getting 6.48

Answer 12

constant also has an \(n\) remember.

Answer 13

n = 5 in this case.

Answer 14

8/25 * (55 + 25)

Answer 15

\[\sf \color{red}{i^2} = \color{blue}{\frac{n(n+1)(2n+1)}{6}}.........5\sum = 5n\]

Answer 16

and just plug n chug.

Answer 17

it's what I did

Answer 18

first sum is 55 second is 5*5

Answer 19

now I have 2/5 * 4/5 = 8/25

Answer 20

8/25 * (55 + 25)

Answer 21

my arithmetic is effed up somewhere

Answer 22

I GET 25.6

Answer 23

see?

Answer 24

if I didn't use summation, it would have been easier laughing out loud

Answer 25

u oly have i = 1,2,3,4,5
if i^2 dint work just check the sum if it the same to 6.48
check ur sol again

Answer 26

yeah, maybe it's \(i\)?

Answer 27

I found the error, it should be 4/25

Answer 28

2/5 (220/25 +25)

Answer 29

still... LAUGHING OUT LOUD wow this is terrible

Answer 30

f=-x^2+5
\[\int\limits_{0}^{2} -x^2+5\]
\[ -x^3/3+5x from 0 to 2\]
\[ -8/3 +10 =10-2.6666=7.3333\]
lol !

Answer 31

it cannot be i only because we're talking about
f(x) = -x^2 + 5
the height must maintain the (2i/5)^2

Answer 32

i know.. I tried that also, @ikram002p

Answer 33

mayb the books wrong?

Answer 34

since 6th edition all the way to 9th edition LAUGHING OUT LOUD it can happen

Answer 35

i don't think the book is wrong

Answer 36

its actully correct
the area btw
6.48 and 8.08

Answer 37

i wanna do the sum ^^

Answer 38

- is missing i think.. nin

Answer 39

minus sign

Answer 40

\(\large =\frac{ 2 }{ 5 }\sum_{i=1}^{5}\frac{ \color{red}{-}4i^2+125 }{ 25 }\)

Answer 41

if he miss minus sighn he wud get num >than 8 or so

Answer 42

hmmk... i just had a cursory glance.. .

Answer 43

thank you guys, I'll take a nap and restore some of that brain juice
i might be able to do it tomorrow... I am so depleted to n00b level at the moment

Answer 44

i got -3.52+10=6.48

Answer 45

I think it's that -4/5 I did a 4/5 instead

Answer 46

its 2/5[(-4/25sum i^2) +(5×125/25)]

Answer 47

2/5[(-4/25 (330/6)) +(25)}
=2/5[-8.8+25}
=-3.52+10=6.48