Question

1. 10×(2y-10)
2. (x+5)×(5x-1)
3. (7-2x)×(2x-7)
bantuin ya, pakai cara plissss....

Answer 1

Tanda titik(.) artinya dikali

1. 10 x (2y-10)


2. (x+5) x (5x-1)
=x.5x + x.(-1) + 5.5x + 5.(-1)
=

3. (7-2x) x (2x-7)
=7.2x + 7.(-7) + (-2x).2x + (-2x).(-7)
=

Answer 2

1. 10x ( 2y - 10) = 20xy - 100x

2. ( x + 5)(5x - 1)
   = (x)(5x) + (x)(-1) + (5)(5x) + (5)(-1)
   =5x² - x + 25x - 5
   = 5x² + 24x - 5

3. ( 7 - 2x)(2x - 7)
  = (7)(2x) + (7)(-7) + (-2x)(2x) + (-2x)(-7)
  = 14x - 49 - 4x² + 14x
  = - 4x² + 28x - 49