Take the square root of both sides:
x + 4 = sqrt(40)
But you have to remember that there are *two* square roots (positive and negative) so:
x + 4 = ± sqrt(40)
Subtract 4 from both sides:
x = -4 ± sqrt(40)
You can simplify a little here if you like:
x = -4 ± 2 sqrt(10)
Anyway there is your answer...
2007-10-15 11:54:40
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answer #1
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answered by Puzzling 7
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(x+4)^2=40 (root each side to cancel the ^2)
x+4="plus or minus" "square root of 40" (Subtract 4 from each side)
Now we will have 2 equations:
1. x = -4 - "square root of 40"
2. x = -4 + "Square root of 40"
Then solve from there
1. x = -4 - ~6.3245 = -10.3245
2. x = -4 + ~6.3245 = 2.3245
Hope this helps.
2007-10-15 12:10:23
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answer #2
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answered by Jonathon L 1
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to get rid of the ^2, you have to do the opposite, square both sides.
so the square root of x+4=square root of 40
2007-10-15 11:55:49
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answer #3
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answered by 3oh!3 fan! 4
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(x+4)^2 = 40, take the square root of each side:
x + 4 = +/- (rt40),
x = +/- (rt40) - 4.
I`m sure you can calculate that.
2007-10-15 11:54:40
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answer #4
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answered by Twiggy 7
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