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That depends on the value of x and y. As an expression, "x + y" can't be simplified.
To factor out the expression: x2y-y3 First factor out one "y": y(x2-y2) The expression x2-y2 is a difference of squares, which factors as well: (y)(x-y)(x+y) This is the simplest factoring of the original expression.
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Simply put, an expression does not need an equal sign, while an equation does. Equation: x+y=z Expression: x+y
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