Show that (-18) = [6 = (-1)] = [(-18) = 6] = (-1)
Show that {(–72) = (-9)} {(-20) = (-5)} = 2
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1 thought on “Show that (-18) = [6 = (-1)] = [(-18) = 6] = (-1)<br />Show that {(–72) = (-9)} {(-20) = (-5)} = 2<br />​”

1. Answer:

   question no. 1.

   by using Associative property of multiplication, we have

   [tex](a \times b) \times c = a \times (b \times c) \\ [/tex]

   let a = – 18, b = 6 and c = –1.

   (–18) × [6 × –1] = [(–18) × 6] × (–1)

   = (–18)× (–6) = –108 × (–1)

   = 108 = 108 hence shown

   question no. 2:

   {(–72)÷(–9)}={(–20)÷(–5)}×2

   let LHS = {(–72)÷(–9)} and RHS= {(–20)÷(–5)}×2

   [tex]lhs = \frac{ – 72}{ – 9} = 8 \\ \\ rhs = \frac{ – 20}{ – 5} = 4 \times 2 = 8[/tex]

   .°. LHS = RHS

   hence shown

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