Quadratics

Quadratics

1. Solving quadratics

   • We can only solve quadratics that equal zero
   • We find the x value (s) where the curve crosses the x axis
   • We can solve in 3 ways
     • Factorise
     • Use the quadratic formula
     • Read from the graph

2. Factorise

   • Put into bracket (s)

3. Solve

   • Find what x equals

4. Factorising with a coefficient of x

   • This is a number infront of x squared
   • Multiply a and c
     • Find the factors that add up to b
       • Substitute in factors, replacing what b originally was
         • Split in half and factorise each half
           • Your answer is the bracket and what's left outside

5. Special Case

   • Where there is two terms,
   • x squared
   • Square number
   • A minus
   • e.g. x2 - 100 is a special case