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9. Find the difference: (2r² - 6r - 7) - (3r² - 5r-8)
A r² +r+ 1
B. r² + r-1
C. r²- r-1
D. -r²-r + 1​


Sagot :

Answer: (2r²+6r+7)-(3r²+5r+8) = -r²+r-1  so it's letter B.

Step-by-step explanation:

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