Answer
(2z-7)(7z-2)
Work Step by Step
You are given $14z^{2}$-53z+14. Factor it out:
$14z^{2}$-49z-4z-14 -break out the middle value-
($14z^{2}$-49z)+(-4z-14) -group the first two and last two terms-
7z(2z-7)-2(2z-7) -Find the GCF of each grouping's-
(2z-7)(7z-2) -factor out the common term-
=(2z-7)(7z-2)