por favor, ajude em matemática?

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• sn1489

  June 2021

  a) 5x(x² - 9y²

  5x(x + 3y)(x - 3y)

  b)(a² + y²)(a² - y²)

  (a² + y²)(a + y)(a -y)

  c)x(y - 5) + 4(y - 5)

  (x + 4) (y - 5)

  d)7x(x³ + 8)

  7x[x + 2](x² - 2x + 2²)

  e) (x + y)² + 5(x + y)

  [x + y](x +y) + 5

  f)(x + y)(x - y) + 2(x - y)

  [x - y](x + y) + 2 e pt saudação.
• -thayss-

  June 2021

  a) 45x³ - 5xy²

  5.(9x³ - xy²)

  5x.(9x² - y²)

  ou

  5x.(3x - y).(3x + y)

  b) a^4 - b^4

  (a² + b²) - (a² - b²)

  (a² + b²) - (a + b).(a - b)

  c) xy - 5x + 4y - 20

  x.(y - 5) + 4.(y - 5)

  (y - 5).(x + 4)

  d) 7x^4 + 56x

  7.(x^4 + 8x)

  7x.(x³ + 8)

  Ou, ainda, aplicando o produto notável da soma de dois cubos:

  7x.(x + 2).(x² - 2x + 4)

  e) x² + 2xy + y² + 5x + 5y

  (x + y)² + 5.(x + y)

  (x + y).[(x + y) + 5]

  f) x² - y² + 2x - 2y

  (x + y).(x - y) + 2.(x - y)

  (x - y).[(x + y) + 2]

  
• chloe-johnson_60b6e48ecac62

  June 2021

  a)45x³-5xy²

  5x( 9x² -y²) = (5x) * (3x + y) * ( 3x - y)

  _________________________________________

  A ^ 4 - B ^ 4 = ( A² +B²) * ( A² - B² )

  ________________________________________

  c) xy -5x +4y -20

  x( y-5) + 4(y-5)

  (x+4) * (y-5)

  ________________________________________

  d) 7x^4 + 56x

  7x( x³ + 8)

  ______________________

  e)x²+2xy+y²+5x+5y

  (x+y)² + 5(x+y)

  ____________________________

  f)x²-y²+2x-2y

  (x+y) * (x-y) + 2(x+y)