(1)x^n+2 -6x^2+n +8x^2
=x^2(x^n-6x^n+8)
=x^2(8-5x^n)
(2)x^2 -21xy +98y^2 +x -7y
=(x-7y)(x-14y)+(x-7y)
=(x-7y)(x-14y+1)
(3)x^2 +6xy +9y^2 -4a^2 +4ab -b^2
=(x+3y)^2-(2a-b)^2
=(x+3y+2a-b)(x+3y-2a+b)
(1)x^n+2 -6x^2+n +8x^2
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