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Lukecrayonz
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3x=sqrt(7)
x=sqrt(7)/3
johnson32
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hi, i got the answer. not sure if anyone done math labs online, how do you input this
03453660
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|dw:1349872076838:dw|
Lukecrayonz
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034 what in the world is wrong with your x's lol
johnson32
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yes, i work this the same, however when inputing it online, coming back incorrect
maybe the symbol
03453660
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@Lukecrayonz hahaha why???
Lukecrayonz
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Looks like a 2pi or 2r or something :P
03453660
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what ever it looks like but its my habit
johnson32
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help, how to write the correct solution set (4-3x)^2=39?
Lukecrayonz
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Expand (4-3x)^2
johnson32
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expand?
Frank1991
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If you expand it you get: (4-3x)*(4-3x)=9x^2 -24x +16
Frank1991
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and then = 9x^2 -24x +16 -39 =0=9x^2 -24x -23
Frank1991
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and use the abc formula
Frank1991
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i mean the Quadratic formula
Frank1991
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I'm dutch, sorry
johnson32
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@ Frank 1991yes I got what you where saying
johnson32
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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
johnson32
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@Frank1991, i meant have to simplify all radicals. heck its multiply choice
johnson32
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use the square root property to solve for the equation. (x-9)^2=64
Frank1991
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in the last case you could say \[\sqrt{(x-9)^{2}}=\sqrt{64}=8=x-9\]
Frank1991
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so x = 8+9
johnson32
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@Frank1991, my answers are as yours, but when i type them in them in the computer labs they come back wrong.
Frank1991
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oh that is strange you could check what wolframalpha is saying
johnson32
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@Frank1991 sure thing
Frank1991
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Yes wolfram alpha is also saying something different
Frank1991
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I forgot about that a sqaure could also be negative
Frank1991
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so we got one answer but forgot about the second
johnson32
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yes
johnson32
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@Frank1991 .. thanks
johnson32
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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..
johnson32
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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?
Frank1991
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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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|dw:1349875404939:dw|
mayankdevnani
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@johnson32 got it
Frank1991
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second one: 1048=16 *t ^2 => t = squarroot( 1048/16) = ...
Frank1991
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I hope it helped @johnson32
johnson32
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@Frank1991 , so you got 0% interest rate,
johnson32
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@mayankdevnani , yes thank you got that one solve already
mayankdevnani
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ok
Frank1991
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no r is the intrest rate
johnson32
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@Frank1991 , I got 65.5 seconds for the object falling at
Frank1991
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so use the quadratic formula for: r^2 +2r +(1-3000/3370.8) = 0 and r would be your answer
johnson32
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got it
Frank1991
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oh the 3000 and 3370.8 should switch
Frank1991
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You obtain r = -2.06 or r=0.06
Frank1991
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r=-2.06 makes no sense because there is an increase not a decrease, so your final answer is 0.06
Frank1991
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got it? @johnson32
johnson32
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yes I got it, thank you