Question

Restrângeți in pătrate:
0.25a² - 2ab + 4b²

Answer 1

Răspuns:

0.25a² - 2ab + 4b² =  (0,5a)² - 2ab + (2b)²  = (0,5a - 2b)²

• (a - b)² = a² - 2ab + b²

• (a + b)² = a² + 2ab + b²

Answer 2

$0.25a {}^{2} - 2ab + 4b ^{2} \\ \frac{1}{4} a - 2ab + 4b^{2} \\ (\frac{1}{2} a - 2b) {}^{2}$