If two sides of an equation are not equal, use inequalities.
Type 1: Linear Inequalities
Solving linear inequalities is just like solving linear equations.
Type 2: Quadratic Inequalities
Step 1: Rearrange the quadratic equation into f(x) > 0 or f(x) < 0
Step 2: Factorise and solve the quadratic equation
Step 3: Sketch a quadratic graph using a number line
Step 4: Solve the quadratic inequalities
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