Question

0,25a2-2ab+4b2
varog ajutatima nu inteleg

Answer 1

0,25a²-2ab+4b²= (a/2-2b)²

se aplica formula x²-2xy+y²=(x-y)²
in cazul nostru
x²=0,25a²=25a²/100 =a²/4  ⇒x=√a²/4  ⇒x=a/2
y²=4b²  ⇒ y=√4b²⇒y=2b
-2xy=-2×a/2×2b=-2ab

Answer 2

$0,25a^{2} - 2ab+ 4b^{2} = \frac{25}{100} a^{2} - 2ab+ 4b^{2} = \frac{1}{4} a^{2}-2ab+ 4b^{2} = ( \frac{1}{2} a-2b )^{2}$

Conform formulei : $a^{2} -2ab+ b^{2} =(a-b )^{2}$