Question

Kerjakan dengan caranya

Answer 1

1.
(x + 3y)³ = ?
= (x + 3y)(x + 3y)(x + 3y)
= (x² + 3xy + 3xy + 9y²)(x + 3y)
= (x² + 6xy + 9y²)(x + 3y)
= x³ + 3x²y + 6x²y + 18xy² + 9xy² + 27y³
= x³ + 9x²y + 27xy² + 27y³

2.
(2x - 3y)²
= (2x - 3y)(2x - 3y)
= 4x² -6xy - 6xy + 9y²
= 4x² - 12xy + 9y²