To evaluate 3-mn with m=-4 and n=-8, we substitute the values of m and n into the expression:
3 - (-4)(-8)
= 3 - (4)(8) (since two negative values multiplied together give a positive value)
= 3 - 32
= -29
Therefore, 3-mn equals -29 when m=-4 and n=-8.
evaluate 3-mn if m=-4 and n=-8
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