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Ket [755]
4 years ago
9

−2∣5w−7∣+9=−7 how do i get the second answer

Mathematics
2 answers:
yarga [219]4 years ago
6 0

we have

  -2\left|5x-7\right|+9=-7

Isolate the absolute value

-2\left|5x-7\right|+9=-7\\-2\left|5x-7\right|=-7-9\\ \left|5x-7\right|=8

First solution

when

+(5x-7)=8\\5x=8+7\\5x=15\\x=3

Second solution

when

-(5x-7)=8\\-5x+7=8\\-5x=8-7\\ -5x=1\\x=-1/5

therefore

<u>the answer is</u>

the solutions are

x=3\\x=-\frac{1}{5}

r-ruslan [8.4K]4 years ago
5 0
To calculate the answers for an expression with an absolute value term. First, we isolate the one with the absolute value. 

<span>−2∣5w−7∣+9=−7
</span><span>−2∣5w−7∣=−7-9 = -16
</span>∣5w−7∣=8

<span>Then, set the quantity inside the absolute value notation equal to + and - the quantity on the other side of the equation.
</span>
5w=8+7
5w = 8-7

The answers are:

w = 3
w = 1/5
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