7√x + 13 = 6
a. √7
b. 49
c. 1
d. no solution
2007-12-22 07:57:12 · 8 answers · asked by mommawe'regoingtohell 1 in Science & Mathematics ➔ Mathematics
Subtract 13 from both sides
7 sqrt(x) = -7
divide by 7:
sqrt x = -1
If you square both sides, you'll get x=1. However, this is an extraneous solution, as this problem has NO solution.
that's it! :)
2007-12-22 08:02:41 · answer #1 · answered by Marley K 7 · 0⤊ 0⤋
7 * sqrt(x) + 13 = 6
7 * sqrt(x) + 13 [-13] = 6 [-13]
7 * sqrt(x) = -7
7 [/7] * sqrt(x) = -7 [/7]
sqrt(x) = -1
sqrt(x) [^2] = -1[^2]
x = -1 * -1
x = 1
But I'm sure that the answer should be i somewhere. It involves the square root of a negative, or at least, was trying to.
2007-12-22 16:06:51 · answer #2 · answered by manualsearch 2 · 0⤊ 0⤋
subtract 13 from each side. it leaves
7 root x = -7
divide both sides by 7, leaves
root x =-1
what number times itself gives -1? Any number multiplied by itself will always be positive, so there is no solution, d)
2007-12-22 16:02:09 · answer #3 · answered by Anonymous · 0⤊ 0⤋
1. add 13 to both sides get
7sqrt(x)=(-7)
2. divide by 7 and get
sqrt(x)=-1
3. square both sides to clear the sqaure root and get
x=1
4 therefore the answer is c
2007-12-22 16:05:21 · answer #4 · answered by shadowca1964 4 · 0⤊ 0⤋
I would say C but dont quote me!! Good Luck!
2007-12-22 16:01:27 · answer #5 · answered by wats2004 2 · 0⤊ 0⤋
x = i*root(7) , i = root(-1)
2007-12-22 16:01:28 · answer #6 · answered by Nur S 4 · 0⤊ 0⤋
no . solution
2007-12-22 16:04:20 · answer #7 · answered by cattbarf 7 · 0⤊ 0⤋
i have absolutely no idea.....
bt im goin to say.....
D
2007-12-22 16:01:16 · answer #8 · answered by Tinkerbell <Dakota> 1 · 0⤊ 0⤋