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b) ( 3 × + y ) ( 3 × y ) ?
c) ( 3 × + y ) ( × + 5 y ) ?
d) ( 3 × + y )² ?
e) ( × - 5 y )² ?
a) (3x + y) ( x - 5y)
= 3x² - 15xy + xy - 5y²
= 3x² - 14xy - 5y²
b) *maaf, soalnya kayaknya kurang lengkap... ( 3 × + y ) ( 3 × (?) y )
c) (3x + y) (x + 5y)
= 3x² + 15xy + xy + 5y²
= 3x² + 16xy + 5y²
d) (3x + y) (3x + y)
= 3x² + 3xy + 3xy + y²
= 3x² + 6xy + y²
e) (x - 5y) (x - 5y)
= x² - 5xy - 5xy + 5y²
= x² - 25xy + 5y²