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combine like terms. (-3y^2 - 7y - 9) - (4y^2 + 6y + 9)

Mathematics
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again. say y^2 is apples and y are oranges.
-7y^2-y+0 or -7y^2-y
thank you both:)

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Other answers:

do you get how mitch got his answer?
-9-9 = -18 not 0
my bad
could it be -7y^2 + 13y + 18?
-7y^2-13y-18
watch ur signs :)
|dw:1347826413332:dw| now add like terms
7y^2 + 13y + 18?
-7y^2-13y-18
ohhhh thank you:)
yeah, watch ur signs carefully next time ok? :)
Okay. Let me go through this one more time. Like terms means exactly what they sound like. suppose you had 5 apples and 4 oranges,. Could you add 5 apples to 4 oranges and say you have 9 apples? No, because apples are not oranges., so when you have something like (-3y^2 - 7y - 9) - (4y^2 + 6y + 9) , this means that you can add the y^2 terms together because they are like terms. Anyway, getting back to the problem. Suppose y^2 is apples. and y is oranges. (-3y^2 - 7y - 9) - (4y^2 + 6y + 9) means that you are subtracting 4 apples and 6 oranges and the number 9 from -3 apples and -7 oranges and the number -9. When you subtract 4 apples from -3 apples, you end up with -7 apples. when you subtract 6 oranges from -7 oranges, you end up with -13 oranges., subtracting 9 from -9 gives you -18. This means that you have -7 apples and -13 oranges and the number -18. In mathematical terms, this is -7y^2 -13y -18
okay sounds good! :)
|dw:1347826655400:dw| no your not multipling you adding or subtracting exapmple so if I was at negative 9 or minus 9 then took -9 more then I'd be at -18 hence why we get -7y^2-13y-18
thank you @dhatraditya that helped :)
and same to you @kmalone99
@madisonmaruhnich94 : that's great. Always try to make those fancy x's and y's mean something that you can relate to.
remember like dhatradutya must be like terms, exactly alike and your welcome your sme age as one of my daughters.

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