What should be added to 2x² + 3x – 5 to get x²  – x + 1?

(a) –x2 – 4x + 6
(b) x2 – 4x + 6
(c) x2 + 4 x – 6
(d) x2 – 4x – 6

Anurag Mishra Professor Asked on 30th June 2016 in Maths.
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1 Answer(s)

Answer: (a) -x² – 4x + 6

Solution:-  
Let added be P.

Then, 2x² + 3x – 5 + P = x²  – x + 1
P = x² – x +1  – 2x² – 3x + 5
P = – x² – 4x + 6.

Then, – x² – 4x + 6  should be added to 2x² + 3x – 5 to get x²  – x + 1.

Hence, the correct answer is option (a) – x² – 4x + 6.

 

Anurag Mishra Professor Answered on 1st July 2016.
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