Question

qual é a resposta desse aí?

Answer 1

a foto nao esta boa, posta outra

Answer 2

$1) \\ (3x+1)^2=(3x)^2+2.3x.1+1^2=9x^2+6x+1 \\ \\ 4) \\ (4x^2-8y)^2=(4x)^2-2.4x^2.8y+(-8y)^2=16x^2-64x^2y+64y \\ \\ 7) \\ (2x^2-3y^2)^2=(2x^2)^2-2.2x^2.3y^2+(-3y^2)^2=4x^412x^2y^2+9y^4 \\ \\ 10) \\ ( \frac{x}{y} - \frac{y}{x} )^2=( \frac{x}{y} )^2+2 \frac{x}{y} \frac{y}{x} +( \frac{y}{x} )^2= \frac{x^2}{y^2} + \frac{y^2}{x^2}$