Substitution (Grade 11 NSC Matric Mathematics): Quizzes

Replace repeated expressions to simplify

Same expression appears at least twice

Identify restrictions on original variable

Values making denominators equal zero

Let a new variable equal it

A quadratic equation

$x \neq 0$ and $x \neq 2$

$k = x^2 - 2x$

$x = -1$, $x = 1$, or $x = 3$

Simple letters like $k$, $u$, or $t$