x² - 49 > 0
2006-10-04 05:49:52 · 6 answers · asked by !*! 2 in Education & Reference ➔ Homework Help
(x-7)(x+7)>0
x+7=0 or x-7=0
x1=-7
x2=7
draw a table for the inequality
x -7 7
---0-----0---
+ | - | +
solution: x<-7 V x>7
2006-10-04 06:32:53 · answer #1 · answered by iyiogrenci 6 · 0⤊ 0⤋
x>7
2006-10-04 13:29:44 · answer #2 · answered by Jjq 2 · 0⤊ 0⤋
x² - 49 >0 can also be written as (x-7)(x+7)>0
Set both parenthesis to zero:
x - 7 > 0 and x + 7 > 0
Now solve for x in both equations
x > 7 and x > -7
Also written as:
-7 < x >7
2006-10-04 13:26:34 · answer #3 · answered by melspags6 4 · 1⤊ 0⤋
x = 7.01
x^2=49.14
x^2-49 = 49.14 - 49 = 0.14
0.14>0
2006-10-04 13:00:19 · answer #4 · answered by nastymerlin 2 · 0⤊ 0⤋
x^2 -49>0
x^2 > 49
x >7,-7
As when you squre -7 or 7, you get the same answer i.e. 49.
2006-10-04 13:19:56 · answer #5 · answered by Apo 1 · 0⤊ 0⤋
x^2 - 49 > 0
x^2 > 49
x > 7
2006-10-04 13:02:21 · answer #6 · answered by dark_vampire_irry 3 · 0⤊ 0⤋