x/2 = 8/x
x*x = 8*2
x^2 = 16
-1x^2 + x^2 = 16 + -1x^2
0 = 16 + -1x^2
-16 + 0 = 16 + -1x^2 + -16
-16 = -1x^2
-1 / -16 = -1x^2 / -1
16 = 1x^2
x={-4, 4}
Can someone tell me why the answer isn't
x={4, 4}
2007-04-07 10:51:52 · 5 answers · asked by Shawn J 1 in Science & Mathematics ➔ Mathematics
x/2 = 8/x
(x)(x) = 2(8)
x² = 16
√x² = ± √16
x = ± 4
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There are two solutions - 4 and 4
x² = 16
Place - 4 in the place of x
(- 4)² = 16
16 = 16
Place the 4 in the place of x
(4)² = 16
16 = 16
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method 2 for - 4
Multiply two negativer (-) numbers results in a positive (+)
(- 4)(- 4) = 16
(- 4)² is the same as multipling
- - - - - - -s-
2007-04-07 12:26:31 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
x/2 = 8/x
x*x = 8*2
x^2 = 16
stop here ... x = +/- 4
2007-04-07 17:58:35 · answer #2 · answered by hustolemyname 6 · 0⤊ 0⤋
cross x^2=16 x= sq.rt.16 x=+/- 4
2007-04-07 17:57:07 · answer #3 · answered by dwinbaycity 5 · 0⤊ 0⤋
since x^2=16, x is either -4 or 4
(-4)/2=8/(-4)
and
4/2=8/4
2007-04-07 18:01:57 · answer #4 · answered by jrome 2 · 0⤊ 0⤋
huh.................................
2007-04-07 18:01:50 · answer #5 · answered by Anonymous · 0⤊ 0⤋