Question

Find the product of(x+3y)(x square-3xy+9y square)

Answer 1

( x + y) ( x² – 3xy + 9y² )

= x ( x² – 3xy + 9y² ) + y ( x² – 3xy + 9y² )

= x³ – 3x²y + 9xy² + x²y – 3xy² + 9y³

= x³ – 2x²y + 6xy² + 9y³

Hope the solution is clear to you!!