Explicação passo a passo:
a)
(10x + y)² = [ ( 10x)² + 2 * 10x * y + ( y)²] =100x² + 20xy + y² >>>>resposta
b)
(3y + 3x)² =[ ( 3y)² + 3 * 3y * 3x + (3x)² ] = 9y² + 18yx +9x² >>>>resposta
c)
(-5+ n)² ou ( 5- n)² = [ ( 5)² - 2 * 5 * n + ( n)² ] = 25 - 10n + n²>>>>resposta
d)
(a + ab)² = [ ( a)² + 2 * a * ab + (ab)² ] = a² + 2a²b + a²b² >>>>>resposta
e)
(x² - 1)² = [( x²)² - 2 * x² *1 + ( 1 )² ]= x^4 - 2x² + 1 >>>>>resposta
f)
(9x² - 1)² = [ ( 9x²)² - 2 * 9x² * 1 + ( 1 )² ] = 81x^4 - 18x² + 1 >>>>>resposta
g)
(x³ - 2)² = [ ( x³)² - 2 * x³ * 2 + ( 2 )² ] = x^6 - 4x³ + 4 >>>>>resposta
h)
(x - 5y³)² = [ ( x )² - 2 * x *5y³ + ( 5y³)² ] = x² - 10xy³ + 25y^6 >>>>resposta
i)
(3x² - 4).( 3x² + 4) = [ ( 3x²)² - ( 4 )2 ] = 9x^4 - 16 >>>>>resposta
j)
(3x² - y²).( 3x² + y²) = [ ( 3x²)² - ( y²)² ] =9x^4 - y^4 >>>>resposta
