if A= 4x³-5x+7, B= 2x²-x²+3 ,C = 5x³-8x²+10. Then, find A- 2B- C
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Given- A= 4x³-5x+7, B= 2x²-x²+3 ,C = 5x³-8x²+10.
Then,
A- 2B- C= 4x³-5x+7- 2(2x²-x²+3)-(5x³-8x²+10)
=> 4x³-5x+7-2(x²+3)-5x³+8x-10
=> -x³+3x-3 -2x²-6
A- 2B- C= -x³-2x²+3x -9= -(x³+2x²-3x +9)
Then,
A- 2B- C= 4x³-5x+7- 2(2x²-x²+3)-(5x³-8x²+10)
=> 4x³-5x+7-2(x²+3)-5x³+8x-10
=> -x³+3x-3 -2x²-6
A- 2B- C= -x³-2x²+3x -9= -(x³+2x²-3x +9)
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