3x^2=7

- anonymous

3x^2=7

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- Lukecrayonz

3x=sqrt(7)
x=sqrt(7)/3

- anonymous

hi, i got the answer. not sure if anyone done math labs online, how do you input this

- anonymous

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## More answers

- Lukecrayonz

034 what in the world is wrong with your x's lol

- anonymous

yes, i work this the same, however when inputing it online, coming back incorrect
maybe the symbol

- anonymous

@Lukecrayonz hahaha why???

- Lukecrayonz

Looks like a 2pi or 2r or something :P

- anonymous

what ever it looks like but its my habit

- anonymous

help, how to write the correct solution set (4-3x)^2=39?

- Lukecrayonz

Expand (4-3x)^2

- anonymous

expand?

- anonymous

If you expand it you get: (4-3x)*(4-3x)=9x^2 -24x +16

- anonymous

and then = 9x^2 -24x +16 -39 =0=9x^2 -24x -23

- anonymous

and use the abc formula

- anonymous

i mean the Quadratic formula

- anonymous

I'm dutch, sorry

- anonymous

@ Frank 1991yes I got what you where saying

- anonymous

i see what you have here, and i have similar, I guess I need to simplify this because it does not show in my options in labs

- anonymous

@Frank1991, i meant have to simplify all radicals. heck its multiply choice

- anonymous

use the square root property to solve for the equation. (x-9)^2=64

- anonymous

in the last case you could say \[\sqrt{(x-9)^{2}}=\sqrt{64}=8=x-9\]

- anonymous

so x = 8+9

- anonymous

@Frank1991, my answers are as yours, but when i type them in them in the computer labs they come back wrong.

- anonymous

oh that is strange you could check what wolframalpha is saying

- anonymous

@Frank1991 sure thing

- anonymous

Yes wolfram alpha is also saying something different

- anonymous

I forgot about that a sqaure could also be negative

- anonymous

so we got one answer but forgot about the second

- anonymous

yes

- anonymous

@Frank1991 .. thanks

- anonymous

The formula A=P (1+r)^2 gives the amount A in dollars that P dollars will grow to in 2 years interst rate r ( where r is given as a decimal), using compound intreset. What interest rate will cause $3000 to grow to $3370.80 in 2 years..

- anonymous

The formula S=16t^2 is used to approximate the distance S, in feet, that an object falls freely from the rest in t seconds. The height of a building is 1048 feet. How long would it take for an object to fall from the top?

- anonymous

To the first question:3000=3370.8(1+r)^2 => 3000=3370.8 (r^2 +2r +1) => r^2 +2r +1 = 3000/3370.8 => r^2 +2r +(1-3000/3370.8) = 0 and solve this for r. Probably one of the answers is negative and that makes no sense

- mayankdevnani

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- mayankdevnani

@johnson32 got it

- anonymous

second one: 1048=16 *t ^2 => t = squarroot( 1048/16) = ...

- anonymous

I hope it helped @johnson32

- anonymous

@Frank1991 , so you got 0% interest rate,

- anonymous

@mayankdevnani , yes thank you got that one solve already

- mayankdevnani

ok

- anonymous

no r is the intrest rate

- anonymous

@Frank1991 , I got 65.5 seconds for the object falling at

- anonymous

so use the quadratic formula for: r^2 +2r +(1-3000/3370.8) = 0 and r would be your answer

- anonymous

got it

- anonymous

oh the 3000 and 3370.8 should switch

- anonymous

You obtain r = -2.06 or r=0.06

- anonymous

r=-2.06 makes no sense because there is an increase not a decrease, so your final answer is 0.06

- anonymous

got it? @johnson32

- anonymous

yes I got it, thank you

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