Respuesta :

sanakhyzerkhan

Answer:

11r²-4r-3

Step-by-step explanation:

soo,, now firstly change the signs of 2nd expression  

so,  

9r²+5r-11+2r²-9r+8

now  

we will combine the same terms like , see next step

9r²+2r²+5r-9r-11+8

11r²-4r-3

Good evening ,

Answer:

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(9r²+5r-11) - (-2r²+9r-8) = 11r² -4r - 3

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Step-by-step explanation:

(9r²+5r-11) - (-2r²+9r-8) =

= (9r²+5r-11) + 2r²- 9r + 8

= 9r²+5r-11 + 2r²- 9r + 8

= (9r²+2r²)+ (5r-9r) + (8-11)  Just put like terms together.

= 11r² -4r - 3.

:)