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(0.3x+1,2y)totul la a doua, vă rog

Răspuns :

= 0.09 x^2 + 0.72 xy + 1,44 y^2
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(0,3x+1,2y)² = (3/10x+6/5y)² 

folosind formula (a+b)²=a²+2ab+b² 

= (3/10x)²+2*3/10x*6/5y+(6/5y)²

= 9/100x² + 18/25xy + 36/25y²