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Ex 12.1, 6 - Chapter 12 Class 8 Exponents and Powers - Part 3

Ex 12.1, 6 - Chapter 12 Class 8 Exponents and Powers - Part 4

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Transcript

Ex 12.1, 6 Evaluate (ii) (5/8)^(−7)×(8/5)^(−4) (5/8)^(−7)×(8/5)^(−4) = 5^(−7)/8^(−7) ×8^(−4)/5^(−4) = 5^(−7)×1/8^(−7) ×8^(−4)×1/5^(−4) = 1/5^7 ×8^7×1/8^4 ×5^4 = 8^7/8^4 ×5^4/5^7 = 8^(7 − 4)×5^(4 − 7) (𝑈𝑠𝑖𝑛𝑔 (𝑎/𝑏)^𝑚=𝑎^𝑚/𝑏^𝑚 ) = 8^3×5^(−3) = 8^3/5^3 = (8 × 8 × 8 )/(5 × 5 × 5) = (64 × 8 )/(25 × 5) = 𝟓𝟏𝟐/𝟏𝟐𝟓

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.