(b) (–21) × [(– 4) + (– 6)] = [(–21) × (– 4)] + [(–21) × (– 6)]
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(-21)×[(-4)+(-6)]=[(21)×(-4)]+[(-21)×(-6)]
L.H.S. R.H.S. (-21)×[(-4)+(-6)] [(-21)×(-4)]+[(-21)× --
=> (-21)×[-4-6]. --(-6)]
=> (-21)×(-10). => 84 +126
=> (-21×-10). =>210
=> 210
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