Question

(9x + 2y)2
Dinomio cuadrado

Answer 1

(a + b)² = a² + 2ab + b²

= (9x + 2y)²

= (9x)² + 2(9x)(2y) + (2y)²

= 81x² + 2(9x)(2y) + 4y²

= 81x² + 18x(2y) + 4y²

= 81x² + 36xy + 4y²