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Example: Subtract 3a^{2}+2ab+5b^{2} from 9a^{2}+7b^{2}. Solution: (9a^{2}+7b^{2})  (3a^{2}+2ab+5b^{2}) = 9a^{2} + 7b^{2}  3a^{2}  2ab  5b^{2} = 6a^{2}+2b^{2}+2ab. Directions: Given the following trinomials, solve the subtraction problems given in the questions. A = x+yz B = y+zx C = z+xy D = 2x+3yz E = 7x8y 
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