Lesson

• solve a quadratic equation by factorisation: $(x-1)(x-2)=0 \require{AMSsymbols} \leadsto x=1,2$
• solve a quadratic equation by completing the square: $(x-3)^2=4 \require{AMSsymbols} \leadsto x = 3-2,3+2$
• solve a quadratic equation by using th equadratic formula: $x = \displaystyle \dfrac{-b \pm \sqrt{b^2-4ac}}{2a}$
• determine the number of solutions uding discriminant: $\bigtriangleup = b^2 – 4ac$