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(√5+x)(5-√5x+xla a 2 a

Răspuns :

Emy78
daca este asa...(pentru ca lipseste o paranteza)
(√5+x)(5-√5+x)²=(√5+x)(25+5+x²-10√5+10x-2√5x)=
=(√5+x)(30-10√5-2√5x+x²)=
=30√5-50-10x+√5x²+30x-10√5x-2√5x²+x³=
=x³-√5x²+(20-10√5)x-50+30√5
(a+b+c)²=a²+b²+c²+2ab+2ac+2bc

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