Question

2x^2 - 15x + 25 =0 ?

Answer 1

2*25 = 50

-10*-5 = 50

-10-5 = -15

(x-10/2) (x-5/2)

x = 5 , 5/2

perhaps?

Answer 2

You should use quadratic formula.

Answer 3

If you factor it. (x-5)(2x-5) = 0
So x=5 or 5/2