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Re: If |4x+6|=30, which of the following could be a value of x? [#permalink]
Bunuel wrote:
If |4x+6|=30, which of the following could be a value of x?

A. -9
B. -4
C. 2
D. 4
E. 9


This question can either be solved by traditional method of solving mod equations or by putting values from the option.

METHOD I: Traditional Method

|4x+6|=30 => 4x+6= 30 or 4x+6 = -30

so the plausible solutions would be: x=6 or -9

METHOD II: Using the options.

Out of all the options, substituting x=-9 will give us the desired result.

Note: Use your discretion to choose which method will be faster. This will come to you with more and more practice. :)



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Re: If |4x+6|=30, which of the following could be a value of x? [#permalink]
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