Question

Help! How do I factor this?

Answer 1

given <<5x^3-15x^2-140x>>
factor out everything in common
5x(x^2-3x-28)
factor polynomial within the parentheses
5x(x+4)(x-7)

Answer 2

Given:
`5x^3-15x^2-140x`

Factor out a 5x:
`5x(x^2-3x-28)`

Find two numbers that multiply to -28 and add up to -3. In this case, -7 and 4:
`5x(x-7)(x+4)`