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b)...=4x^2(x+1)-16(x+1)=
=(x+1)(4x^2-16)=(x+1)(2x-4)(2x+4)
c)...=4x^2(x-5)-4(x-5)=
=(x-5)(4x^2-4)=(x-5)(2x-2)(2x+2)
b)...=4x^2(x+1)-16(x+1)=
=(x+1)(4x^2-16)=(x+1)(2x-4)(2x+4)
c)...=4x^2(x-5)-4(x-5)=
=(x-5)(4x^2-4)=(x-4)(2x-2)(2x+2)