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Question

Simplify using commutative and distributive property:
$$(-8)\times 3 - 2\times 8 = .....$$


A
8
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B
40
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C
8
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D
40
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Solution

The correct option is D $$-40$$
$$(-8)\times 3 - 2\times 8$$
$$=(-8)\times 3 - 8\times 2$$ ($$\because$$ commutative property)
$$(-8)\times 3 - (-8)\times 2$$
$$= (-8) \times [3 + 2]$$ ($$\because$$ distributive property)
$$= (-8) \times 5$$
$$= -40$$.

Mathematics

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