18x[7+(-3)] - [18x7] + [18x(-3)] ii) (-21) x [(-4) + (-6) ] = [(-21) x (-4)] + [(-21)x(-4)]
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1. 18x[7+(-3)] - [18x7] + [18x(-3)]
= 18×(7 - 3) - 126 - 54
= 18×4 - 126 - 54
= 54 - 126 -54
= (-126) (ans.)
2. (-21) x [(-4) + (-6)]
= (-21) × (-4 -6)
= (-21) × (-10)
= 210 (ans.)
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