Lisa L.

asked • 10/03/16

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If A=3x2 +5x-6 and B = -2x2 -6x +7 then what does A-B equal

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David W. answered • 10/03/16

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Align (or group) "like terms:"
 
     A=   3x2   + 5x  -  6
     B = -2x2   -  6x  + 7
---------------------------
A-B =  5x2   + 11x  -13
 
 
If A=3x2 +5x-6 and B = -2x2 -6x +7 then what does A-B equal
   A - B = 3x2 + 5x - 6  - ( -2x2 -6 x +7)
   A - B = 3x2 + 5x - 6  + 2x2 + 6x - 7
   A - B = (3+2)x2 + (5+6)x + (-6-7)
   A - B = 5x2 + 11x - 13
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Michael A. answered • 10/03/16

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A-B = 3x² + 5x - 6 - (-2x² -6x + 7) = 3x² + 5x + 6 + 2x² + 6x - 7 = 5x² + 11x - 13
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Michael A.

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I apologize. I miscopied the original problem. The solution to the problem I wrote is correct, but it is not the solution to your given problem. I have corrected it. However, David W. has already provided the correct answer. Thank you!
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10/03/16

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