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prisoha [69]
3 years ago
8

What is the solution set of 2x^2+x=15○3,-5/2○-3,5/2○2,-3/2

Mathematics
2 answers:
kozerog [31]3 years ago
7 0
Rewrite 2x^2+x=15 as <span>2x^2+ x - 15 = 0.  Use your favorite method to solve this for x.  I prefer synthetic div., so will check out whether or not 2 is a root:

     ____________
2  /   2     1     -15
               4      10
    ---------------------
       2      5      -5   Since there is a non-zero remainder, 2 is NOT a root.  Eliminate the 3rd answer choice.

Try -3.  If used as a divisor in synth. div., will the remainder be zero or not zero?  If zero, then -3 is a solution / root.  

And so on.</span>
artcher [175]3 years ago
3 0

Answer:

its the first one

Step-by-step explanation:

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