Answer
( 4y - 14)(3$x^{2}$ -1 )
Work Step by Step
12$x^{2}$y -42$x^{2}$ - 4y + 14 group term
( 12$x^{2}$y - 4y ) -( 42$x^{2}$ -14)
4y(3$x^{2}$ -1 ) -14(3$x^{2}$ - 1) factor out GCF from each grouping
( 4y - 14)(3$x^{2}$ -1 )
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