dengan menggunakan segitiga pascal, tentukan lah : a. (x-2y)2 b.(2x-y)3 c. ( x-y)4

a. 1 2 1
x²+ 2(x)(-2y) + (-2y)²
= x² - 4xy + 4y²
b. 1 3 3 1
= (2x)^3 + 3(2x)²(-y) + 3(2x)(-y)² + (-y)^3
= 8x^3 - 12x²y + 6xy- y^3
c.1 4 6 4 1
= (x)^4 + 4(x)^3(-y)+ 6(x)²(-y)² + 4(x)*(-y)^3 + (-y)^4
= x^4 - 4x^3 y +6x²y² - 4xy^3 + y^4