Posted by **mema** on Sunday, May 22, 2011 at 12:47am.

add the following

(-8x^2-2x+4)+(x^2-9x+7)

- algebra -
**Anonymous**, Sunday, May 22, 2011 at 2:00am
(-8x^2-2x+4)+(x^2-9x+7)=

-8x^2+x^2 -2.4x+(-9x) +4+7=

-7x^2 -2.4x-9x +11=

-7x^2 -11.4x +11

- algebra -
**Jai**, Sunday, May 22, 2011 at 2:02am
(-8x^2-2x+4)+(x^2-9x+7)

to add, we just combine the numerical coefficients (or the numbers before the variable) of the same variables (meaning same letters and same exponents).

thus,

(-8x^2 - 2x + 4 ) + ( x^2 - 9x + 7 )

-7x^2 - 11x + 11

hope this helps~ :)

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