anonymous
  • anonymous
(squaredrootof)-3x+6=x+4. Solving square root equations. :)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
which part is under the sqrt?
anonymous
  • anonymous
the -3x+6.
anonymous
  • anonymous
okay

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More answers

Mertsj
  • Mertsj
|dw:1326859234891:dw|
Mertsj
  • Mertsj
x=-10 x=-1
anonymous
  • anonymous
x = -10, -1
anonymous
  • anonymous
dang it you beat me!
Mertsj
  • Mertsj
But -10 does not check so discard it.
anonymous
  • anonymous
its extraneous
anonymous
  • anonymous
what do you mean by "not checking"
Mertsj
  • Mertsj
so the only answer is -1
Mertsj
  • Mertsj
If you put it back in the original equation, it does not make a true sentence.
Mertsj
  • Mertsj
|dw:1326859474196:dw|
anonymous
  • anonymous
ahhh... so i know on the2nd to 3rd step you skipped the math involved.. i get -3x=x^2+8x+10 am i correct?
anonymous
  • anonymous
well, would you count it or not because you could do -6,6 = -10+4, one of those is true
anonymous
  • anonymous
oh i see.
anonymous
  • anonymous
|dw:1326859540983:dw|
anonymous
  • anonymous
fail
Mertsj
  • Mertsj
Yes Luci, you are correct
Mertsj
  • Mertsj
mridrik watch
anonymous
  • anonymous
so you divide it all by -3... right? to get x alone?
anonymous
  • anonymous
but sqrt(36) also = 6, and -10 + 4 is -6, so - 6 = -6 but 6 ~= -6
Mertsj
  • Mertsj
|dw:1326859647986:dw|
anonymous
  • anonymous
only use principle square root in this case?
anonymous
  • anonymous
whoops nevermind... blonde moment. ://
anonymous
  • anonymous
hey, i am blonde, watch it
Mertsj
  • Mertsj
Luci, subtract 3x from both sides.
Mertsj
  • Mertsj
mridrik, did you look at the drawing I made? The square root symbol means the POSITIVE root
anonymous
  • anonymous
Mertsj... yeah, lol i barely saw that :/ and mridrik.. im blonde too so it's okay:)
anonymous
  • anonymous
But why wouldnt you also accept the - root? -6^2 is also 36
Mertsj
  • Mertsj
(squaredrootof)-3x+6
anonymous
  • anonymous
yeah only blondes can make fun of blondes
Mertsj
  • Mertsj
Is that not the original problem? Do you see anything there about the negative root?
anonymous
  • anonymous
the original problem says sqrt(-3x+6) = x + 4, if x is negative ten, then sqrt(36) = x + 4, the square root of 36 is positive and negative 6, I'm just wondering why you dont use the negative six, I understand some problems just mean the principle square root, but how do i know when it means that?
anonymous
  • anonymous
that's a good question... i don't know?
Mertsj
  • Mertsj
The answer is no
Mertsj
  • Mertsj
Here is the original problem
Mertsj
  • Mertsj
|dw:1326860480067:dw|
anonymous
  • anonymous
yes.
Mertsj
  • Mertsj
It does NOT say this:
Mertsj
  • Mertsj
|dw:1326860542618:dw|
Mertsj
  • Mertsj
Therefore it is ONLY the POSITIVE root
anonymous
  • anonymous
oooooohhhhhh... awesomee:)

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