<img src="https://tex.z-dn.net/?f=%20%7C7%20%2B%208x%7C%20%20%3E%205" id="TexFormula1" title=" |7 + 8x|

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3 years ago

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I've tried solving this inequality multiple times and I just can't get it right. I don't know what I'm doing wrong. please help

Mathematics

1 answer:

ExtremeBDS [4]3 years ago

3 0

The absolute value is defined as

$|x|=\begin{cases}x&\text{if }x\ge0\\-x&\text{if }x$

So for example, if x = 3, then |x| = |3| = 3, since 3 is positive. On the other hand, if x = -5, then |x| = |-5| = -(-5) = 5, since -5 is negative. The absolute value is always positive.

For the inequality |7 + 8x| > 5, you consider the two cases where the argument to the absolute value (the expression you find inside the bars) is either positive or negative.

• If 7 + 8x ≥ 0, then |7 + 8x| = 7 + 8x, so that

$|7+8x|>5\implies 7+8x>5 \implies 8x>-2 \implies x>-\dfrac14$

• Otherwise, if 7 + 8x < 0, then |7 + 8x| = -(7 + 8x), so that

$|7+8x|>5\implies-(7+8x)>5\implies7+8x$

The solution to the inequality is the union of these two intervals.

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