Asked by Anonymous

Can you check my answer and the work? Thank youu~~

(2x-y)7

128x7 -448x6y -672x5y2 -560x4y3 -280x3y4 -84x2y5 -14xy6 -y7

orr

128x7 -448x6y +672x5y2 - 560x4y3 +280x3y4 -84x2y5 +14xy6 -y7


Ps: the 7 in the equation is the exponent and the numbers after the variable are also the exponent
Answered by helper
+ 672x^5y^2 - 280x^3y^4 + 14xy^6

only the signs were wrong for the above
corrections

I used an online calculator to expand so I know it's right
Answered by Anonymous
so is it this?
128x7 -448x6y +672x5y2 - 560x4y3 +280x3y4 -84x2y5 +14xy6 -y7

or

128x7 -448x6y +672x5y2 -280x3y4 +14xy6

?
Answered by helper
sorry, I didn't see your 2nd line after
"or", so the correction applies to your first line/answer
Answered by Anonymous
k thank youuu~~~ =)
Answered by helper
you're welcome
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