Question

gente me ajudem preciso pra daqui a pouco​

Answer 1

a)

$(x + 3)( {x}^{2} + 6x - 2) = \\ {x}^{3} + 6 {x}^{2} - 2x + 3 {x}^{2} + 18x - 6 = \\ {x}^{3} + 9 {x}^{2} + 16x - 6$

b)

$(a - b)( {a}^{2} + ab - {b}^{2} ) = \\ {a}^{3} + {a}^{2} b - a {b}^{2} - {a}^{2} b - a {b}^{2} + {b}^{3} = \\ {a}^{3} - 2a {b}^{2} + {b}^{3}$

c)

$( {a}^{2} - ay + {y}^{2} )(2a + y) = \\ 2 {a}^{3} + {a}^{2} y - 2 {a}^{2}y - a {y}^{2} + 2a {y}^{2} + {y}^{3} = \\ 2 {a}^{3} - {a}^{2} y + a {y}^{2} + {y}^{3}$

d)

${x}^{2} ( {x}^{2} - 2x - 5)(x - 2) = \\ {x}^{2} ( {x}^{3} - 2 {x}^{2} - 2 {x}^{2} + 4x - 5x + 10) = \\ {x}^{2} ( {x}^{3} - 4 { x }^{2} - x + 10) = \\ {x}^{5} - 4 {x}^{4} - {x}^{3} + 10 {x}^{2}$