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Find the Sum or Difference (2x7+6x9−7−7x8)−(2−2x8+3x9−7x7)\left( 2 x ^ { 7 } + 6 x ^ { 9 } - 7 - 7 x ^ { 8 } \right) - \left( 2 - 2 x ^ { 8 } + 3 x ^ { 9 } - 7 x ^ { 7 } \right)

Question 254

Multiple Choice

Find the sum or difference.
- (2x7+6x9−7−7x8) −(2−2x8+3x9−7x7) \left( 2 x ^ { 7 } + 6 x ^ { 9 } - 7 - 7 x ^ { 8 } \right) - \left( 2 - 2 x ^ { 8 } + 3 x ^ { 9 } - 7 x ^ { 7 } \right)


A) 9x9−9x8−5x7−59 x ^ { 9 } - 9 x ^ { 8 } - 5 x ^ { 7 } - 5
B) 3x9−9x8−5x7−53 x ^ { 9 } - 9 x ^ { 8 } - 5 x ^ { 7 } - 5
C) 9x9−9x8−5x7−99 x ^ { 9 } - 9 x ^ { 8 } - 5 x ^ { 7 } - 9
D) 3x9−5x8+9x7−93 x ^ { 9 } - 5 x ^ { 8 } + 9 x ^ { 7 } - 9

Correct Answer:

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