mugegs2015 mugegs2015

07-08-2017
Mathematics

contestada

Help Please..

Factor the following as the sum of two cubes.
8000 + a^3

Respuesta :

ghanami ghanami

07-08-2017

hello :
8000 = 8 ×1000 = 2 ^3 ×10^3 = 20 ^3
note; identity b^3 +a^3 = (a+b) (a²+b² - ab)
in this exercice : b=20
so : 8000+b^3 = (a+20)(a²+400 - 20a).... Factor the following

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