Question

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Answer 1

Hey there :)

( 5y + 9 )( 6y - 1 )

We need to use FOIL to expand, that is
First Terms
Outer Terms
Inner Terms
Last Terms

     First          Outer         Inner      Last
( 5y )( 6y ) + ( 5y )( - 1 ) + 9 ( 6y ) + 9 ( - 1 )
    30y²     -        5y      +    54y   -       9

Combine, if any, the like-terms
30y² + 49y - 9

Answer 2

Hey there,

(5y + 9) (6y-1)
= 5y*6y - 5y + 6y*9 - 9
= 30y² - 5y + 54y - 9
= 30y²+ 49y - 9

Hope this helps !

Photon