Translating 'the difference of and ' and 'subtract from '
Translate each English phrase into an algebraic expression and simplify:
(a) "The difference of and ": The keyword difference signals subtraction, and the prepositions of and and identify the two quantities in their given order. Translate as . Since subtracting a negative is equivalent to adding a positive: .
(b) "Subtract from ": The phrase "subtract from " always means — the number that follows from is written first in the expression. Translate as . Both terms are negative, so add the absolute values and keep the negative sign: .
The order of the operands is critical. With difference of, the first quantity named is written first (). With subtract from, the quantity after from is written first (), reversing the reading order. Mixing up the order is a common error.
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