Solve: 5x2 + 25x = 0.

5x² + 25x = 0

5x (x) + 5x (5) = 0

5x (x + 5) = 0

5 5

x (x + 5) = 0

x = 0 or x + 5 = 0

- 5 - 5

x = - 5

So we frist need to simpleflie

5x2 + 25x = 0

witch is

25x + 5x2 = 0

5x (5 + x) = 0

so we dont need the factor 5x

so that means the frist x=0

and the secon one

5 + x = 0

but we still add - 5 to both sides

so it would end up like this

x = 0 + - 5

with then you redude that it is

x=-5

so it x=0, - 5