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4(4x² + 168x - 540)/4
(4x)² + 168(4x) -2160/4
w² + 168w - 2160/4
(w + 180)(w - 12)/4
(4x + 180)(4x - 12)/4
4(x + 45) (4x -12)/4
(x + 45)(4x -12)
4x² +168x-540 = (x + 45)(4x -12)
x1 = -45
x2 = -3