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We perform the quadratic formula on a quadratic equation on y:
y = -59x ± √(59²x² + 240x²) = -59x ± √(3481x²+240x²) = -59x ±  √3721x²
                     -30                               -30                             -30
= -59x ± 61x = -x/15 or 4
So we have (y+x/15)(y-4x)
So we multiply the other by 15 and the other by -1 since we have -15y
4x²+59xy-15y² = (15y+x)(4x-y)