if A= 4x³-5x+7, B= 2x²-x²+3 ,C = 5x³-8x²+10. Then, find A- 2B- C
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A- 2B- C
= 4x³-5x+7 -2(2x²-x²+3)-(5x³-8x²+10)
= 4x³-5x+7-2(x²+3)-5x³+8x²-10
= 4x³-5x+7-2x²-6-5x³+8x²-10
= 4x³-5x³-2x²+8x²-5x+7-6-10
= -1x³+6x²-5x-9
= 4x³-5x+7 -2(2x²-x²+3)-(5x³-8x²+10)
= 4x³-5x+7-2(x²+3)-5x³+8x²-10
= 4x³-5x+7-2x²-6-5x³+8x²-10
= 4x³-5x³-2x²+8x²-5x+7-6-10
= -1x³+6x²-5x-9
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