Multiply and simplify
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To do this problem, we can use a process called FOIL. FOIL stands for (F)irst, (O)uter, (I)nner, (L)ast.
For "F" we multiply the first term of each parentheses: 12y and y getting 12y²
For "O" we multiply the outer terms of each parentheses: 12y and -5 getting -60y
For "I" we multiply the inner terms of each parentheses: 9 and y getting 9y
And for "L" we multiply the last terms of each paretheses: 9 and -5 getting -45
Now we add them all together: 12y² - 60y + 9y - 45
Combine like terms and our final answer is: 12y² - 51y - 45
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