Question

calculando (10x + y)², obtemos ?

Answer 1

bonsouir cher ami !!


(10x + y)² = (10x)^2 + 2*10x*y + ( y)^2


= 100x^2 + 20xy +y^2


A Bientot

Answer 2

Use a formula do quadrado da soma 

(a + b)² = a² + 2ab + b²

====
(10x + y)²

(10x)² + 2.10x . y + y²
=> 100x² + 20xy + y²