How to Use the CAS Calculator in GeoGebra

Arithmetic

Open CAS under  View in  Menu.

• To add $36+87$, type

  36 + 87

  and press Enter.

• To subtract $143-46$, type

  143 - 46

  and press Enter.

• To multiply $13\times 15$, type

  13 * 15

  and press Enter.

• To divide $132÷12$, type

  132 / 12

  and press Enter.

Powers and Roots

1.

Open CAS under  View in  Menu.

2.

Powers:

To calculate $x^p$, type x^p and press Enter.

Roots:

To calculate $x^{\frac{1}{n}}$, type x^1/n and press Enter.

If want to compute a square root, you can use the command sqrt(<x>) instead. sqrt is short for “square root”.

Note! GeoGebra only prints the positive root, even if there’s a negative root too.

Algebraic Expressions

Open CAS under  View in  Menu.

• To compute $2a+3a$, type

  2a + 3a

  and press Enter.

• To compute $ab\cdot b^2$, type

  a * b * b^2

  and press Enter. You get $a{b}^3$. If you type

  ab * b^2

  you get $ab\cdot b^2$, because GeoGebra interprets ab as an object, and not the product $a\cdot b$.

Fractions

1.

Open CAS under  View i  Menu.

2.

Type /. A fraction bar should appear, which consists of two empty fields for the numerator and the denominator, respectively. Type the numerator of your fraction first, and then click on the second field and type your denominator. Press Enter when you’re done.

Note! CAS simplifies fractions automatically.

Rounding

1.

Open CAS under  View i  Menu.

2.

If you want to round the number to an integer, use

round(<x>)

where you replace <x> with your number.

3.

If you want to round your number to a specific number of decimal places (lower than the number of decimal places there currently are), use

round(<x>, <y>)

where you replace <x> with your number, and <y> with the number of decimal places.

Expanding Parentheses

1.

Open CAS under  View in  Menu.

2.

Type your expression in CAS and click Expand  from Toolbar.

Factorization

1.

Open CAS under  View in  Menu.

2.

Type your expression in CAS and click Factor  in Toolbar.