given: x is a nonzero real number
a. x2^[to the second power] is positive
b. x > 0
c. - x < 0
d. all of theese
?? help ! thanks!
2007-10-23 06:28:27 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
a: the square of any nonzero real number is positive. However, b and c are only true if x is positive, and it is possible that x is negative, so a is the sole correct answer.
2007-10-23 06:31:56 · answer #1 · answered by Pascal 7 · 2⤊ 0⤋
A
x is either positive or negative, so you have to try each statement with both cases. If X is negative, B is wrong, and C is wrong if X is positive. But, a positive times a positive is positive, and a negative times a negative is positive.
2007-10-23 06:32:03 · answer #2 · answered by juicy_wishun 6 · 0⤊ 0⤋
a
2007-10-23 06:40:53 · answer #3 · answered by timdoas 3 · 0⤊ 0⤋
(a) SURE
2007-10-23 06:39:14 · answer #4 · answered by namvt2000 6 · 0⤊ 0⤋