4 - (x^2) ≥ 0
Way to do it...
-1( (x^2) - 4 ) ≥ 0
(x^2) - 4 ≤ 0
x^2 ≤ 4
|x| ≤ 2
-2 ≤ x ≤ 2
One question:
1) If this is the best way to do it...why ever factor to make (x-2)(x+2) in any problem (inequality or not)? Doesn't the GMAT warn against directly solving for x in quadratics without factoring?
Way to do it...
-1( (x^2) - 4 ) ≥ 0
(x^2) - 4 ≤ 0
x^2 ≤ 4
|x| ≤ 2
-2 ≤ x ≤ 2
One question:
1) If this is the best way to do it...why ever factor to make (x-2)(x+2) in any problem (inequality or not)? Doesn't the GMAT warn against directly solving for x in quadratics without factoring?
