Question
Simplify: [4 MARKS]
i)(58)−7×(85)−5
ii)(25)2×7383×7
i)(58)−7×(85)−5
ii)(25)2×7383×7
Answer:
:
Each: [2 Marks]
i)(58)−7×(85)−5
=5−78−7×8−55−5
=5−75−5×8−58−7
=5(−7)−(−5)×8(−5)−(−7)
(∵aman=am−n)
=5−2×82=8252=6425
ii)(25)2×7383×7
(25)2×7383×7
= (25×2)×73(23)3×7
(∵(am)n=am×n)
= 210×7329×7
=210−9×73−1=2×72
=2×49=98
Was this answer helpful ?
:
Each: [2 Marks]
i)(58)−7×(85)−5
=5−78−7×8−55−5
=5−75−5×8−58−7
=5(−7)−(−5)×8(−5)−(−7)
(∵aman=am−n)
=5−2×82=8252=6425
ii)(25)2×7383×7
(25)2×7383×7
= (25×2)×73(23)3×7
(∵(am)n=am×n)
= 210×7329×7
=210−9×73−1=2×72
=2×49=98
Was this answer helpful ?
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