1.

Simplification of 2x2 + 5x – 1 + 8x + x2 + 7 – 6x + 3 – 3x2 is ………………A) 7x – 9B) – 7x + 9C) 7x + 9D) 6x + 9

Answer»

Correct option is  C) 7x + 9

2x2 + 5x - 1 + 8x + x2 + 7 - 6x + 3 - 3x2 

= 2x+ x2 - 3x2 + 5x + 8x - 6x - 1 + 7 + 3

 = (2 + 1 - 3)x2 + (5 + 8 - 6)x + 10 - 1

 = 02 + 7x + 9

 = 7x + 9



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