Add.9x8 - 8x4 + 8x2 + 6  and  7x7 + 5x4 - 4x

A. 16x8- 3x4 + 8x2 - 4x + 6
B. 9x8 + 7x7- 3x4 + 8x2 - 4x + 6
C. 16x8 - 13x4 + 8x2 - 4x + 6
D. 9x8 + 7x7+ 3x4 + 8x2 - 4x + 6

Answer: B

Mathematics

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