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Can somebody help me? I've tried to solve this problem and I just can't manage to get the right answer: 7x + 2 > 2
 2 years ago
 2 years ago
Can somebody help me? I've tried to solve this problem and I just can't manage to get the right answer: 7x + 2 > 2
 2 years ago
 2 years ago

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satellite73Best ResponseYou've already chosen the best response.1
true for all x by inspection absolute value is positive, so it is always bigger than 2
 2 years ago

a123Best ResponseYou've already chosen the best response.0
how do you write it like a < x < b or something like that?
 2 years ago

satellite73Best ResponseYou've already chosen the best response.1
it is all real numbers x can be anything. do not try to solve this using algebra. absolute value of anything is always greater than or equal to 0, so it must be always greater than 2. it doesn't matter what you put in for x, positive number or negative number
 2 years ago

satellite73Best ResponseYou've already chosen the best response.1
\[(\infty,\infty)\]
 2 years ago

a123Best ResponseYou've already chosen the best response.0
wait, why is one of the infinity symbols negative if x is always greater than or equal to 0?
 2 years ago

LagrangeSon678Best ResponseYou've already chosen the best response.0
what satellite means by (inf,inf) is that you can plug any x value into the inequality, you can plug in 20000, 200, 3,4, 5, it dosent matter, you will still get a value greater than or equal to zero
 2 years ago

a123Best ResponseYou've already chosen the best response.0
i still don't understand why, if you plug in a negative number, it comes out to be greater than or equal to zero
 2 years ago

LagrangeSon678Best ResponseYou've already chosen the best response.0
beacuse of the absolute value, you see the absolute value guarantees you that the value you get out will be positive or zero, it cannot be negative
 2 years ago
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