danielahchf
danielahchf danielahchf
  • 08-10-2018
  • Mathematics
contestada

I need some help with this!

I need some help with this class=

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 08-10-2018

(-x³ +3x +4) -(2x³ +7x² -9) = -x³ +3x +4 -2x³ -7x² +9 . . . . eliminate parentheses

= x³(-1-2) +x²(-7) +x(3) +(4+9)

= -3x³ -7x² +3x +13 . . . matches the second choice.

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