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kicyunya [14]
2 years ago
8

Solve the equation 5+7 | 2x-1 | = -44

Mathematics
1 answer:
dlinn [17]2 years ago
3 0

The easy part is isolating the absolute-value term:

5 + 7 |2<em>x</em> - 1| = -44

7 |2<em>x</em> - 1| = -49

|2<em>x</em> - 1| = -7

Remember that the absolute value function returns a positive number that you can think of as the "size" of that number, or the positive distance between that number and zero. If <em>x</em> is a positive number, its absolute value is the same number, |<em>x</em>| = <em>x</em>. But if <em>x</em> is negative, then the absolute value returns its negative, |<em>x</em>| = -<em>x</em>, which makes it positive. (If <em>x</em> = 0, you can use either result, since -0 is still 0.)

The important thing to take from this is that there are 2 cases to consider: is the expression in the absolute value positive, or is it negative?

• If 2<em>x</em> - 1 > 0, then |2<em>x</em> - 1| = 2<em>x</em> - 1. Then the equation becomes

2<em>x</em> - 1 = -7

2<em>x</em> = -6

<em>x</em> = -3

• If 2<em>x</em> - 1 < 0, then |2<em>x</em> - 1| = - (2<em>x</em> - 1) = 1 - 2<em>x</em>. Then

1 - 2<em>x</em> = -7

-2<em>x</em> = -8

<em>x</em> = 4

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3 years ago
8-3(p-4)=2p<br><br> Show Work PLEASE
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