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Comment on (x+2)(x-4)
Why is this answer choice D
Be careful. We aren't
Be careful. We aren't concluding that x EQUALS -2.5
We're concluding that x is GREATER THAN -2.5
So, for example, x COULD equal -2.3 in which case Quantity B is greater.
Conversely, x COULD equal -1 in which case Quantity A is greater.
Or... x COULD equal -2 in which case the two quantities are EQUAL
So, the answer must be D
If we had the equality sign
Be careful, when it comes to
Be careful, when it comes to negative numbers the number with the number with greater the magnitude is the smaller number.
For example, -100 < -5
----------------------
QUANTITY A: x
QUANTITY B: -2
IF the inequality were x ≥ -2.5, then answer would still be D.
If x ≥ -2.5, then...
x COULD equal -2.1, in which case quantity B is greater
x COULD equal -2, in which case the quantities are equal
x COULD equal -1, in which case quantity A is greater
On the other hand, IF the inequality were x ≤ -2.5, then answer would be B.
Does that help?
Cheers,
Brent
I had the same mistake. Read
It's a bit confusing. Careful
Agreed!
Agreed!
What would the difficulty
I'd say this is a medium
I'd say this is a medium-level question (in the 150-159 range)
Cheers
Brent