When you enter an expression into the calculator, the calculator will simplify the expression by expanding multiplication and combining like terms. Use the following rules to enter expressions into the calculator.
Any lowercase letter may be used as a variable.
Exponents are supported on variables using the ^ (caret) symbol. For example, to express x2, enter x^2. Note: exponents must be positive integers, no negatives, decimals, or variables. Exponents may not be placed on numbers, brackets, or parentheses.
Parentheses and Brackets
Parentheses ( ) and brackets [ ] may be used to group terms as in a standard expression.
Multiplication, Addition, and Subtraction
For addition and subtraction, use the standard + and - symbols respectively. For multiplication, use the * symbol. A * symbol is optional when multiplying a number by a variable. For instance: 2 * x can also be entered as 2x. Similarly, 2 * (x + 5) can also be entered as 2(x + 5); 2x * (5) can be entered as 2x(5). The * is also optional when multiplying parentheses, example: (x + 1)(x - 1).
Order of Operations
The calculator follows the standard order of operations taught by most algebra books - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. The only exception is that division is not supported; attempts to use the / symbol will result in an error.
Division, Square Root, Radicals, Fractions
Division, square root, radicals, and fractions are not supported.
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Polynomial Exponents Lessons
The previous lesson explained how to simplify exponents of a single term inside parentheses, like the problem below.
This lesson covers how to simplify exponents on parentheses that contain a polynomial (more than one term), like the problem below.
(x3 + y4)2
Because the two terms inside parentheses are not being multiplied or divided, the exponent outside the parentheses can not just be "distributed in". Instead, a 1 must be multiplied by the entire polynomial the number of times indicated by the exponent. In this problem the exponent is 2, so it is multiplied two times:
1(x3 + y4)(x3 + y4)
Use the FOIL Method to simplify the multiplication above, then combine like terms.
x6 + x3y4 + x3y4 + y8
x6 + 2x3y4 + y8
Multiplication and Division
Examine the problem below.
Recall that multiplication is implied when there is no sign between a variable or set of parentheses and a number, another variable, or another set of parentheses. Therefore in this problem, the x3 and y4 are being multiplied.
In the next problem the x2 and x are being multiplied. The difference is that a * is present which explicitly indicates multiplication. We will solve this problem, then return to the first problem on the page.
(x2 * x)3
Because there is no addition or subtraction inside the parentheses, the exponent can be just "distributed" in and simplified:
(x2*3 * x3)
x6 * x3
Notice that this gives the same result as if we had simplified the inside of the parentheses first, as we have done below.
(x2 * x)3
So why are there two different methods of solving this problem? The first method, where the exponent was distributed in can be applied to the first problem on this page, whereas the second method cannot.
We will now apply the "distribute in" method to the first problem presented on this page.
This method will also work when the terms are being divided, like the problem below:
(x2 / x)3
Again, the exponent is just "distributed" in:
(x2*3 / x3)
(x6 / x3)
Fractions are really just a division problem which is shown in a special form. Since we can just "distribute" in the exponents for an ordinary division problem, we can do the same for a fraction. Look over the example below:
We can just distribute in the 3, as in the other problems.
As you can see, once the 3 was distributed, the parentheses could be removed. Then the 23 was simplified.
Exponents of Polynomials (Parentheses) Resources
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