Question

add
(5x^2-5xy+y^2)+(8x^2-9xy-y^2)+(x^2+xy-9y^2)
i got -2x^2-13xy-9y^2??

Answer 1

this is number 59 by the way lol

Answer 2

compare our first terms\[=14x^2-13xy-9y^2\]

Answer 3

yeah, what happened with those firs tterms

Answer 4

wait! that 8x^2 is negative!! typo! sorry!

Answer 5

if the 8x^2 was negative then your answer is right

Answer 6

(5x^2-5xy+y^2)-8x^2+9xy+y^2+(x^2+xy-9y^2)
=-2x^2+5xy-7y2
try that!

Answer 7

oh, just the 8x^2 is negative? yes then you are correct, thanks ag...