Question

Aljabar tolong pakai cara
a.(10x - 3)(2x + 3y)
b.(7 - x)(7x - 1)
tolong bantu saya

Answer 1

A. 
b. 

Answer 2

A. (10x-3)(2x+3y)
  10x X 2x + 10x X 3y - 3 X 2x - 3 X 3y
 = 20x^2 + 30xy - 6x^2 -9y 
 =14x^2 + 30xy - 9y

b. (7-x)(7x-1)
 = 7 X 7x - 7 X 1 - x X 7x + x X 1
 = 49x - 7 - 7x^2 + x
 =-7x^2 + 50x -7