# Math in PHP??

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### #1 jeremic

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Posted 24 October 2006 - 11:12 PM

Im creating a website with math functions but not the simple stuff. I'm not starting anything until I can get somethign confirmed. Is it possible in PHP to create a script to calculate lets say (x+y)^2

### #2 trq

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Posted 24 October 2006 - 11:34 PM

Have you looked at the math functions?

### #3 jeremic

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Posted 25 October 2006 - 12:31 AM

Yes I have but what I'm trying to find out if a function can be created to raise arbitrary variables such as X and Y to powers as stated above. I know that you can raise a number to a power but can you raise a letter? and get a letter as an out put??

(x + y)^3 = x^3 + 3x^2y + 3xy^2 + y^3

### #4 doni49

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Posted 25 October 2006 - 12:41 AM

NO you can't "raise a letter".  But a raise a variable--YES.

\$x = 2;
\$y = 4;

\$a = \$y + \$x;  //\$a will equal 6
\$a = \$y * \$x;  //\$a will equal 8

\$a = pow(\$x, 2); //\$a will equal 4  ->  (2 squared)
\$a = pow(\$y, -2); //\$a will equal 2 -> (square root of 4)
Don

### #5 Barand

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Posted 25 October 2006 - 06:35 AM

\$a = pow(\$y, -2); //\$a will equal 0.0625 -> (1 / 4^2)
\$a = pow(\$y, 1/2); //\$a will equal 2 -> (square root of 4)
If you are still using mysql_ functions, STOP! Use mysqli_ or PDO. The longer you leave it the more you will have to rewrite.

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### #6 extrovertive

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Posted 25 October 2006 - 07:29 AM

Basially, he wants a function that can do his Algebra homework.

He's not asking us to do any calcuating that will output a numeric value - just factoring Algebric expression.

Like, inputting "(x-y)^2" in the textbox will output "x^2 -xy -xy + y^2" or "x^2 -2xy + y^2" (simpfiled).

Inputting "(x + y)^3" will output "x^3 + 3x^2y + 3xy^2 + y^3"

If that's the case, seems complicated...

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