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MA_775_DIABLO [31]
3 years ago
9

Given f(x)=2x^2+9x+k, and the remainder when f(x) is divided x+7 is 32, then what is the value of k?

Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
6 0

Set up either long division or synthetic div.  I'd do the latter.

Your divisor for synth. div. should be -7.

                           __________  
Then              -7 /  2      9      k
                                    -14   +35
                          --------------------
                             2      -5      k+35                 Rem is 32; 
                                                                     Let 32 = k + 5 and solve for k:

                                                                           k = -3.

Let's check that.  Is k correct?

Then              -7 /  2      9      -3
                                    -14   +35
                          --------------------
                             2      -5      -3+35  = 32

Since the rem is 32, we are correct; k = -3.  
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