Question

Factor each trinomial below. Please show your work and check your answer.
1)a2 – 5a – 20

Answer 1

Is your question right??

Because it is not factorisable...

Answer 2

well thats what it said but i hered i might have to use quuadratic formula

Answer 3

Yeah I am thinking the same..

\[a = \frac{5 \pm \sqrt{25 + 80}}{2} \implies a = \frac{5 \pm \sqrt{105}}{2} = ??\]

This is not factorisable I think..