Variable Expressions

Math Quiz

 







A variable is a letter that represents an unspecified number. Substitute a number for each variable and perform the arithmetic operations in order to evaluate the expression.
For instance, to evaluate the expression x2 + 2x - 3y for x = 1 and y = 2, calculate the expression by substituting the given x and y:
x2 + 2x - 3y = 12 + 2×1 - 3×2 = 1 + 2 - 6 = -3.




Evaluate each expression below if a = 4, b = 2 and c =-1:

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