Question

Hi! I would like to ask help on solving this: 400000=600000(1+r)^5. Your help would be greatly appreciated. Thanks ahead!

Answer 1

First divide by 600000, then take the 5th root of both sides to eliminate the ^5.
Since its an odd exponent its ok to have a negative under the radical. Then you'll have some number (-20000^(1/5))=(1+r). Subtract one from both sides to find r.

Answer 2

I'm sorry. If I'm not mistaken, you mean I should divide both sides by 600000 right? So 400000/600000=0.666. May I ask how you were able to arrive to -20000?

Answer 3

just noticed that that 6 number had one more 0 than the 4 one haha so my number is wrong. But yea divide. I didn't notice that 0 so you're right, you'd get 2/3.

Answer 4

just ignore me...my math is very off. I subtracted. But yes, you divide and you'd get what you got.

Answer 5

Yeah. That's what I actually did at first. Just wanted to confirm it 'cause when I checked it, it seems to be wrong. O.o

Answer 6

hmm..well the 5th root of that will be pretty ugly...but its the only way I can see to possibly do that

Answer 7

Definitely ugly. Let me check again. Thanks for the help, though! :D

Answer 8

Gosh, it's waaaaaaaaaaaaaay too far. :/

Answer 9

\[\sqrt[5]{2}\]
\[\sqrt[5]{3}\]
If those were over each other as a fraction, you'd have to rationalize ( I think thats the word?) so you don't have a sqrt in the denominator. Uh oh...way too far?

Answer 10

Yeah. Haha. The answer didn't even reach like beyond 50.

Answer 11

Oh this shouldn't even be 1 I don't think?

Answer 12

Actually, I'm not also so sure with the equation. This is the problem: A new car that costs Php 600 000 decreased in value to Php 400 000 after 5 years. Find the average annual rate of depreciation.

Answer 13

huh..well I have no idea what you'd do for that. My only understanding of depreciation comes from basic accounting..

Answer 14

what is the answer?

Answer 15

Hmm. 25 something hahaah

Answer 16

I'll try to use another formula.

Answer 17

yea that isn't the right formula, it looks like its the formula for annual interest if I'm not mistaken

Answer 18

I think it is. I just tried it out if it would work. haha

Answer 19

haha yea not so much!

Answer 20

Hey, it's strange. I used a formula for depreciation rate and I arrived at the same result.

Answer 21

haha that is strange

Answer 22

:(((((