Factor by pairing: 8x4 - 24x + 14x3 -42

Can you please explain the steps of how you got the answer?

Thank you!

Use grouping and factoring

(8x^4+14x^3) -(24x+42) factor common factors

=2x^3(4x+7x) - 6(4x+7) factor (4x+7)

=(4x+7)(2x^3-6)