Difference between revisions of "Substitute Command"

Revision as of 09:12, 22 July 2013

Substitute[ <Expression>, <from>, <to> ]

Substitutes from in expression with to.

Examples:

Substitute[(x^2 / (4x + 6))^2 + 6(x^2 / (4x + 6)) + 8, x^2, a*(4x + 6)] yields a² + 6 a + 8.
Substitute[(3 m - 3)^2 - (m + 3)^2, m, a] yields 8 a² - 24 a.

Substitute[ <Expression>, <Substitution List> ]: Substitutes in expression every variable of the list with the variable or number you choose for it.; Example: Substitute[2x + 3y - z, {x = a, y = 2, z = b}] yields 2a - b + 6.

@@ Line 4: / Line 4: @@
 ;Substitute[ <Expression>, <from>, <to> ]
 :Substitutes ''from'' in ''expression'' with ''to''.
-:{{example| 1=<div><code><nowiki>Substitute[(x^2 / (4x + 6))^2 + 6(x^2/(4x+6)) + 8, x^2, a*(4x + 6)]</nowiki></code> yields ''a<sup>2</sup> + 6 a + 8''.</div>}}
+:{{examples| 1=<div>
-:{{example| 1=<div><code><nowiki>Substitute[(3 m - 3)^2 - (m + 3)^2, m, a]</nowiki></code> yields ''8 a<sup>2</sup> - 24 a''.</div>}}
+:*<code><nowiki>Substitute[(x^2 / (4x + 6))^2 + 6(x^2 / (4x + 6)) + 8, x^2, a*(4x + 6)]</nowiki></code> yields ''a<sup>2</sup> + 6 a + 8''.
+:*<code><nowiki>Substitute[(3 m - 3)^2 - (m + 3)^2, m, a]</nowiki></code> yields ''8 a<sup>2</sup> - 24 a''.</div>}}
 ;Substitute[ <Expression>, <Substitution List> ]
 :Substitutes in ''expression'' every variable of the list with the variable or number you choose for it.
-:{{example| 1=<div><code><nowiki>Substitute[2x + 3y - z, {x=a, y=2, z=b}]</nowiki></code> yields ''2a - b + 6''.</div>}}
+:{{example| 1=<code><nowiki>Substitute[2x + 3y - z, {x = a, y = 2, z = b}]</nowiki></code> yields ''2a - b + 6''.}}