Question
$(-3)(-4)(12)(-1) =$ ............
✓
Answer
$(-3)(-4)(12)(-1) = (-3)(-4)(-12)$
[$\because$ $(12)(-1) = (-12)] = (-3)(48)$
[$\because$ $(-4)(-12) = 48] = -(3 × 48) = -144$
Hence, $(-3)(-4)(12)(-1) = -144$
[$\because$ $(12)(-1) = (-12)] = (-3)(48)$
[$\because$ $(-4)(-12) = 48] = -(3 × 48) = -144$
Hence, $(-3)(-4)(12)(-1) = -144$
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