\(2x^2 – 7x – 4\) factorises as \((2x + 1)(x – 4)\). \((2x + 1)(x – 4) = 0\). \(2x + 1 = 0 \) means \(x = -\frac{1}{2}\). \(x – 4 = 0\) means \(x = 4 ...

For tips on how to do this, look at Factorising quadratics and Factorisation of further ... plot and read off the solutions to quadratic equations by using a graphical method – so only do ...