1.

Which polynomial is to be subtracted from x2 + 13x + 7 to get the polynomial 3x2 + 5x – 4?

Answer»

Let the required polynomial be A. 

∴ (x2 + 13x + 7) – A = 3x2 + 5x – 4 

∴ A = (x2 + 13x + 7) – (3x2 + 5x – 4) 

= x2 + 13x + 7 – 3x2 – 5x + 4 

= x2 – 3x2 + 13x – 5x + 7+4 

= -2x2+ 8x + 11 

∴ – 2x2 + 8x + 11 must be subtracted from x2 + 13x + 7 to get 3x2 + 5x – 4



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