# Double brackets

### Expanding double brackets

Expanding two sets of brackets to form a quadratic.

### Factorising quadratic expressions

Factorising a quadratic expressions in to double brackets.

### Mixed double bracket problems.

Mixed problems involving factorising quadratics and expanding double brackets.

### Solving quadratics by factorising

Solve a set of quadratic equations by factorising.

### Solving quadratics by using the quadratic formula

Solve a set of quadratic by using the quadratic formula.

### Solving quadratics mixed problems

Solve a set of quadratic by factorising and using the quadratic formula.

### Completing the square

Re-write a quadratic in the form (x + p)² + q

### Solving a quadratic by completing the square

Re-write a quadratic in the form (x + p)² + q, and then solve.