Question

What are the solutions of 5x2 = 20x?

Answer 1

\[5x^2 - 20x = 0\]

Take 5x common:

\[5x(x-4) = 0\]

Separately put them = 0:

\[x = 0 \qquad and \qquad (x-4) = 0\]

So,

\[x = 0 \qquad and \qquad x= 4\]

Answer 2

Thanks