1)(a-3)^3-(a+4)^3= 2)(15-a)^2-(20+a)^2=. Created by oxsi28. algebra-ru

1)(a-3)^3-(a+4)^3= 2)(15-a)^2-(20+a)^2=...

July 2022 1 23 Report

1)(a-3)^3-(a+4)^3= 2)(15-a)^2-(20+a)^2=

Answers & Comments

Djasurxon 1)
(a-3)^3-(a+4)^3=(a-3-a-4)((a-3)^2+(a-3)(a+4)+(a+4)^2)=-
-7(a^2-6a+36+a^2+a-12+a^2+8a+16)=
-7(3a^2+3a+40)=-21a^2-21a-280

2)(15-a)^2-(20+a)^2=(15-a-20-a)(15-a+20+a)=
(-2a-5)35=-70a-175

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