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Mathematics 16 Online
OpenStudy (anonymous):

Choose the correct simplification of the expression (−2x + 8y)(9x − 3y). −18x^2 + 78xy − 24y^2 18x^2 + 78xy − 24y^2 −18x^2 − 78xy + 24y^2 −18x^2 + 72xy − 24y^2

OpenStudy (mertsj):

Use FOIL

OpenStudy (anonymous):

I understand its foil but ive tried to solve it and don't get the right answer

OpenStudy (mertsj):

What is F: -2x(9x) ?

OpenStudy (anonymous):

yes -18

OpenStudy (mertsj):

(-2x)(9x)=-18x^2

OpenStudy (anonymous):

okay so next is -2x(-3y)

OpenStudy (anonymous):

-2x(-3y)= 6xy

OpenStudy (mertsj):

yes

OpenStudy (anonymous):

then is it -2x(8y)?

OpenStudy (mertsj):

No. After Outer, do Inner which is (8y)(9x)

OpenStudy (anonymous):

72xy then one more which is -2x(8y)?

OpenStudy (anonymous):

or no 8y(-3y)

OpenStudy (anonymous):

equals -24^2 so is D

OpenStudy (mertsj):

yes. (8y)(-3y)

OpenStudy (anonymous):

can you help me with one more?

OpenStudy (mertsj):

|dw:1374543772252:dw|

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