Question

$( {2ab - b)}^{2}$
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Answer 1

4a^2b^2-2ab^2-2ab^2+b^2=
4a^2b^2-4ab^2+b^2

Answer 2

Explicação passo-a-passo:

(2ab - b)² =

(1° termo)² - 2.1°termo.2°termo + (2°termo)²

(2ab - b)² = (2ab)² - 2.2ab.b + (b)²

(2ab - b)² = 4ab² - 4ab² + b²

(2ab - b)² = b²(4a - 4a + 1)