👤

Descompuneti in produs de factori primi expresia (2x+5) la a 3 -8x-20 va rog ajutatima 

Răspuns :

(a+b)³=a³+3a²b+3ab²+b³
(2x+5)=8x³+3·4x·5+3·2x·25+125=8x³+60x²+150x+125
(2x+5)³-8x+20=8x³+60x²+150x+125-8x+20=8x³+60x²+142x+145