Substitution (Grade 11 NSC Matric Mathematics): Flashcards

Replacing a repeated expression with a single variable

Same expression appears at least twice in equation

Identify restrictions on the original variable

To avoid invalid solutions violating equation's domain

Let a new variable equal the repeated expression

Solve the simplified equation

Substitute back to find the original variable

Check answers against all restrictions

$k$, $u$, or $t$

Quadratic equation