Geometry_Hater
How the heck do you expand 2x  y^7?



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Geometry_Hater
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(2x  y) ^7
i meant

Argos
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Foil it out

precal
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or use pascal's triangle

Geometry_Hater
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i dont know how to use pascals triangle properly

Geometry_Hater
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I dont know what numbers to use for it really.

precal
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have you been shown pascal's triangle, this usually happens in algebra 2 or precal

precal
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dw:1357255357277:dw

Geometry_Hater
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yes i've seen the triangle but im unsure which row of numbers im using

precal
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we need the 7th row
1 7 21 35 35 21 7 1

precal
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dw:1357255487760:dwlets go back to one you know (x+y)^2

precal
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dw:1357255543811:dwdo you see the pattern?

Geometry_Hater
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i see

precal
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dw:1357255613641:dwdw:1357255598900:dw

precal
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notice what is happening to x
x^2, x^1, x^0
notice what is happenting to y
y^0, y^1, y^2

precal
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we will use the same patter for your problem

Geometry_Hater
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so the power of x goes down while the power of y goes up?

precal
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yes

precal
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dw:1357255801781:dw

precal
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dw:1357255969026:dw

precal
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dw:1357256006811:dwok just simplify it now