Question

solve by factoring 10t^2 – t − 2 = 0

Answer 1

(2t-1)(5t+2)=0

Hope this helps.

Answer 2

Try to work it backwards now.
(2t - 1)(5t + 2) = 0
(2t * 5t) + (2t*2) + (5t*1) + (2*-1) = 0
This will give you the original equation.