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b. (6p-5q-2r) + (-8p+6q+9r)
6p-5q-2r-8p+6q+9r
6p-8p-5q+6q-2r+9r
= -2p+q+7r
c. (8x²+4x-21) + (6x²-14x+7)
8x²+4x-21 + 6x²-14x+7
8x²+6x²+4x-14x-21+7
= 14x²-10x-14