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f)
e)
2.79
f)
e)
f) x^3-4x^2+5x=3x^2-8x+5
d) -x^2+7=-2x
2.76
d) 5+2x^3-6x^6=6x^2-36x^5
b) x^5-2x^4+x+1= 5x^4-8x^3+1
2.78
a)(4x-1)(x^5+2)=4x^6+8x-x^5-2=24x^5-8-5x^4
b)(2x^2-3)(4x^2+3x)= 8x^4+6x^3-12x^2-9x= 32x^3+18x^2-24x-9