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3x -m = x² +mx - 3
x² + mx - 3 - 3x + m = 0
x² + (m-3) x + (m-3)= 0
berpotongan di dua titk jika D > 0
b² - 4ac > 0
(m-3)² - 4(1)(m-3) > 0
m² -6m +9 - 4m +12 > 0
m² - 10 m + 21 > 0
(m-7)(m-3) > 0
3 > m > 7