Question

can someone help me with pre calc?

Answer 1

Whatis the first step to prove that
Ssubn=> 2+4+6+...+2n=n(n+1)

Verify that S sub n is valid for n=1
Assume that S sub n is valid for n=k
Show that S subn is valid for n=k
Prove that S sub n is valid for n=k+1

Answer 2

@KeganMoore

Answer 3

woah... @hope_nicole <--- taking pre calc i think 0.o

Answer 4

she isn't on.... @KeganMoore

Answer 5

use the series arthmetic formula
Sn = n/2 (2a1 + (n-1)d)

Answer 6

im not good in pre cal...and she said she would brb

Answer 7

with a1 is the first term (known a1 = 2)
and d is difference each term, we get d = a2-a1 = 4-2 = 2

Answer 8

now, apply them into the formula above

Answer 9

Sn = n/2 (2a1 + (n-1)d)
Sn = n/2 (2*2 + (n-1)2)
Sn = ... simplify

Answer 10

@RadEn that lost me

Answer 11

it's not solving the equation.... @RadEn

Answer 12

i know, can u simplify the equation i said above ?

Answer 13

no it made no sense to me i'm doin' terrible in this class

Answer 14

oh i see... u want proving by induction, right
sorry, didnt read it :)

Answer 15

it's fine that's what I thought lol thanks

Answer 16

this site might useful :)
read here :
http://www.basic-mathematics.com/proof-by-mathematical-induction.html