# Difference between revisions of "Formula plotting-students"

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− | Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com]. | + | Most websites use forums that are not suitable for math and make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com]. |

When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system. | When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system. |

## Revision as of 10:57, 15 July 2005

Most websites use forums that are not suitable for math and make it very difficult to enter formulas in questions and in text. Not so on Algebra.Com.

When you submit a question, you can use powerful formula notation, **if you want to**. You only need to know a few things about this huge system.

Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.

Squares and powers are entered using the CARET symbol:

{{{ x^2-2x-3 }}} {{{ x^y }}}

**Square root** is entered using the sqrt function notation

{{{ sqrt( b^2-4ac ) }}}

**Logarithm** is entered using "log" function notation

{{{ log( 2, x ) }}} <-- logarithm of x with base 2 {{{ log( y ) }}} <-- ogarithm of y without base

Multiplication is entered using *, division is entered using /.

Equations and inequalities are entered using =, <, >, >=, <= signs:

{{{ x = sqrt( y^2+1 ) }}} {{{ x >= sqrt( y^2+1 ) }}} {{{ x <= sqrt( y^2+1 ) }}} {{{ x >= sqrt( y^2+1 ) }}}

**Use parentheses ( and ) properly!**. Rememver the a+b/c+d means something else than (a+b)/(c+d)!

Examples:

(a+b)/(c+d) <--- a plus b, DIVIDED by c plus d (x^2-1)/(x-1) sqrt( 28 ) <--- square root of 28 sin( x ) + cos( x ) <--- sine function of x plus cosine of x