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kolezko [41]
4 years ago
5

Will someone help -2x-1>-21 or 2x+7>37

Mathematics
1 answer:
WARRIOR [948]4 years ago
6 0
-2x - 1 > - 21
-2x > -21 + 1
-2x > -20
x < -20/-2
x < 10

2x + 7 > 37
2x > 37 - 7
2x > 30
x > 30/2
x > 15

solution : x < 10 , x > 15
graphed : open circle on 10, shaded to the left : open circle on 15,shaded to the right.
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False

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In this case, i woudnt reccomend to use integration by parts, becuase you are not simplifying the expression by doing an integration and a derivation. It is not easy to integrate 1/x³+1, and if you derivate it, then a natural logarithm would appear, and the integral wont be easier after this parts step.

It is a better idea to use integration by substitution. Note that if you replace x³+1 by a variable y, we have that dy = 3x² dx. We can easily make a 3xdx appear in the integral by multiplying and dividing by 3, solving the integral easily:

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