x^2-18=0
solve in square roots
2007-03-04 16:13:24 · 4 answers · asked by yep yep yep 3 in Science & Mathematics ➔ Mathematics
x= +( square root of 18 ) and
x= - ( square root of 18)
2007-03-04 16:19:23 · answer #1 · answered by rohan1985 2 · 0⤊ 0⤋
x^2-18=0
Add 18 to both sides
x^2=18
Take the square root of both sides
x= +â18 and -â18 or you can write it as:
x= â(9*2) and -â(9*2)
x= 3â2 and -3â2
2007-03-05 00:19:15 · answer #2 · answered by bluefairy421 4 · 0⤊ 1⤋
x equals the square root of 18
2007-03-05 00:16:01 · answer #3 · answered by arsenic sauce 6 · 0⤊ 1⤋
x^2 - 18 = 0
Move the -18 to the right hand side.
x^2 = 18
Now, take the square root of both sides, keeping in mind that we have to include "plus or minus" when doing so.
x = +/- sqrt(18)
18 can be expressed as 9*2, so
x = +/- sqrt(9)sqrt(2)
x = +/- 3sqrt(2)
2007-03-05 00:16:49 · answer #4 · answered by Puggy 7 · 0⤊ 1⤋