Question

Factorize the following:
5x − 15x²

Answer 1

The greatest common factor of the terms 5x and 15x² of the expression 5x - 15x² is 5x. 
Now,
5x = 5x \[\times\]1 and
-15x² = 5x \[\times\] -3x

Hence, the expression 5x - 15x² can be factorised as 5x(1 - 3x)​.