Decompose the following polynomials into factors (x-4x) &# 178; + 8 (x-4x) + 16

Decompose the following polynomials into factors (x-4x) &# 178; + 8 (x-4x) + 16


(x-4x)²+8(x-4x)+16
=(x-4x+4)²
=(-3x+4)²
=(3x-4)²



If x ^ 2-2 (m-1) x + m ^ 2 can be written as the complete square of a binomial, then the value of M is


x^2-2(m-1)x+m^2
= x^2-2(m-1)x+(m-1)^2+2m-1
=(x-m+1)^2+2m-1
This formula conforms to a binomial complete square,
1. 1-m ≠ 0, that is, m ≠ 1
2. 2m-1 = 0, i.e. M = 1 / 2
To sum up, M = 1 / 2



For indefinite integral: 1, ∫ DX / x ^ 4 (2x ^ 2-1) below are denominators 2, ∫ x ^ 4 / (x + 1) ^ 100 DX


First question:
The original formula = - ∫ [1 / x ^ 2 (2x ^ 2-1)] d (1 / x)
Let 1 / x = u, then x = 1 / u
The original formula = - {1 / (1 / U) ^ 2 [2 (1 / U) ^ 2-1]} Du
   =-∫[u^4/(2-u^2)]du
   =∫[(u^4-4+4)/(u^2-2)]du
   =∫[(u^2+2)(u^2-2)/(u^2-2)]du+4∫[1/(u^2-2)]du
   =∫(u^2+2)du+4∫[1/(u+√2)(u-√2)]du
   =∫u^2du+2∫du+√2∫[(u+√2-u+√2)/(u+√2)(u-√2)]du
   =(1/3)u^3+2u+√2∫[1/(u-√2)]du-√2∫[1/(u+√2)]du
   =(1/3)(1/x)^3+2/x+√2ln|u-√2|-√2ln|u+√2|+C
   =(1/3)/x^3+2/x+√2ln|1/x-√2|-√2ln|1/x+√2|+C
   =(1/3)/x^3+2/x+√2ln|1-√2x|-√2ln|1+√2x|+C
Second question:
Let x + 1 = u, x = U-1, DX = Du
The original formula = ∫ [(U-1) ^ 4 / u ^ 100] Du
   =∫[(u^2-2u+1)^2/u^100]du
   =∫[(u^4+4u^2+1-4u^3-4u+2u^2)/u^100]du
   =∫(1/u^96)du+6∫(1/u^98)du+∫(1/u^100)du-4∫(1/u^97)du-4∫(1/u^99)du
   =-(1/95)/u^95-(6/97)/u^97-(1/99)/u^99+(4/96)/u^96+(4/98)/u^98+C
   =-1/[95(x+1)^95]+1/[24(x+1)^96]-6/[97(x+1)^97]
    +2/[49(x+1)^98]-1/[99(x+1)^99]+C