Solving Quadratic Equations

Hello 3E4,

We have learnt the 4 different methods of solving a linear quadratic equation.
They are by
1) Factorisation
2) Quadratic formula
3) Completing the square &
4) Graphical method.

Which method would you use for solving this equation:
x ² - x - 5 = 0 ?

Explain why you chose that method.

Factorise me!

We can use completing the square or cross-method to factorise a quadratic expression.

Can x ² + x + 1 be factorised using any of the methods?

Why / why not?

I'm NOT square!

Is (a + b) ² = a ² + b ² ??

Explain that (a + b) ² = a ² + 2ab + b ² with the help of the diagram below: