Simplify: 7^-20-7^-21. ML AGGARWAL CLASS VIII. INDICES CYP 2.
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7^-20 - 7^-21
=>7^-20 -70^(-20-1)
=>7^-20 -7^-20/7
=>7^-20{1-1/7}
=>7^-20(6/7)
=>6.7^-21 (ans)
=>7^-20 -70^(-20-1)
=>7^-20 -7^-20/7
=>7^-20{1-1/7}
=>7^-20(6/7)
=>6.7^-21 (ans)
Abhigyan1:
Where did you find 70 in the second step.
its just mistake okay
7^-20-7^(-20-1)
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