a cube - 2 a square +4a-5-(-a cube+2a square-8a+5)
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a^3-2a^2+4a-5-(-a^3+2a^2-8a+5)
a^3-2a^2+4a-5+a^3-2a^2+8a-5
2a^3-4a^2+12a-10
2(a^3-2a^2+6a-5)
Put value of a you will get answer
a^3-2a^2+4a-5+a^3-2a^2+8a-5
2a^3-4a^2+12a-10
2(a^3-2a^2+6a-5)
Put value of a you will get answer
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