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p-q= -x3 + 4x2 +11x -7
b)p+q= x7 + x5 -8x4 +3x3 -3
p-q = x7 - x5- 8x4 -3x3 +9
c) p+q= x5 + 10x4 +8x2 -x +1
p-q = -x5 +10x4 -6x2 +x +1