You need to know:
The general formula of a quadratic is y=ax2+bx+c
Quadratic equations can be solved by:
(i) factorisation by D.O.T.S 'ac' method seeing it
(ii) completing the square x2±bx=(x±b2)2-(b2)2
(iii) using the quadratic formulax=−b±√b2−4ac2a
remember plotting ≠ sketching!
How to sketch and get method marks:
a>0 then ∪ , a\(b2−4ac>0 there are 2 real different roots, b2−4ac=0 there are 2 equal R roots, b2−4ac\(x-axis crossing y-axis crossing
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