2007-05-23 02:02:13 · 17 answers · asked by saeed hatafi 1 in Science & Mathematics ➔ Mathematics
x² - 1 = 0
add 1 to both sides of the equation
x² = 1
x = 1, x= -1
.
2007-05-23 02:05:08 · answer #1 · answered by Robert L 7 · 0⤊ 0⤋
+-1
2007-05-23 02:04:21 · answer #2 · answered by pey h 1 · 0⤊ 0⤋
x^2-1=0 can be written as x^2-1^2=0 which is a difference of two squares problem. hence the equation can be written as (x+1)(x-1)=0
which means x-1=0 or x+1=0
therefore from above x= -1 or +1
2007-05-23 02:16:46 · answer #3 · answered by Shepherd 1 · 0⤊ 0⤋
1 or -1.
2007-05-23 02:05:27 · answer #4 · answered by raanin 2 · 0⤊ 0⤋
x^2 - 1 = 0
(x+1)(x-1) = 0 (this is always how to factor a difference of two squares)
x = 1, -1
2007-05-29 04:32:21 · answer #5 · answered by scoffron 2 · 0⤊ 0⤋
simple. x^2 - 1=0,
move 1 to the other side to have x^2=1,
then, square root both sides of the equation to get your answer, x=-1, x=+1.
2007-05-30 16:51:44 · answer #6 · answered by Lucas Vandross 3 · 0⤊ 0⤋
x^2-1=0
=>(x+1)(x-1)=0
Therefore either x+1=0 or x-1=0
x=+/- 1 ans
2007-05-23 02:08:32 · answer #7 · answered by alpha 7 · 0⤊ 0⤋
x^2 - 1= 0.
x^2 = 1
x = +/- square root of 1
x = +/- 1
2007-05-29 20:16:49 · answer #8 · answered by geloi 2 · 0⤊ 0⤋
x² = 1
x = ± 1
2007-05-23 07:28:59 · answer #9 · answered by Como 7 · 0⤊ 0⤋
x^2-1=0
add one to both sides
x^2=1
Square root : x=1, or negative one.
To check, plug in each answer.
1times 1 minus 1 equals zero It works
-1 times -1 -1 equals zero. That works too.
2007-05-28 10:26:03 · answer #10 · answered by Da Absta 1 · 0⤊ 0⤋