For how many integers x is the following true: /2-4x/<14
Please show your work! Thanx!!
Please show your work! Thanx!!
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|2 − 4x| < 14
This implies:
2 − 4x < 14 AND 2 − 4x > -14
-4x < 12
x > -3
-4x > -16
x < 4
Therefore:
x > -3 AND x < 4
Which can be combined and written as:
-3 < x < 4
Or, in interval notation:
(-3, 4)
Therefore, this is true for all the numbers in between, but not including -3 and 4, so:
4 − (-3) − 1
= 4 + 3 − 1
= 6 integers.
This implies:
2 − 4x < 14 AND 2 − 4x > -14
-4x < 12
x > -3
-4x > -16
x < 4
Therefore:
x > -3 AND x < 4
Which can be combined and written as:
-3 < x < 4
Or, in interval notation:
(-3, 4)
Therefore, this is true for all the numbers in between, but not including -3 and 4, so:
4 − (-3) − 1
= 4 + 3 − 1
= 6 integers.
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Since we have absolute values, we are going to have two versions: a positive and a negative version.
|2-4x|<14
2-4x<14 or 2-4x>-14
-2 -2 -2 -2
-4x<12 -4x>-16
/-4 /-4 /-4 /-4
x>-3 x<4
It looks like this is going to work for all integers between -3 and 4.
|2-4x|<14
2-4x<14 or 2-4x>-14
-2 -2 -2 -2
-4x<12 -4x>-16
/-4 /-4 /-4 /-4
x>-3 x<4
It looks like this is going to work for all integers between -3 and 4.
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Separate into two cases, one where 2-4x is greater than or equal to zero and one where 2-4x is less than zero.