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Deitzaandreea
a fost răspuns

Folosind formula [a+b]²=a²+ab+b²,calculati ca in modelul urmator:(x+3)²=x²+2·x·3²=x²+6x+9
(x+5)²=.....
(x+7)²=.....
(3x+5)²...

Răspuns :

Miladydanceclub
formula e a² +2ab +b²
(x+5)²= x² + 10x + 25
(x+7)² = x² +14x +49
(3x + 5)² =9x² +30x + 25

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